Merge remote-tracking branch 'qatar/master'

* qatar/master:
  FATE: fix the asyncts test
  build: Drop gcc-specific warning flag from header compilation rule
  FATE: add a test for the asyncts audio filter.
  matroskadec: return more correct error code on read error.
  buffersrc: check ff_get_audio_buffer() for errors.
  lavfi: check all ff_get_video_buffer() calls for errors.
  lavfi: check all avfilter_ref_buffer() calls for errors.
  vf_select: avoid an unnecessary avfilter_ref_buffer().
  buffersrc: avoid creating unnecessary buffer reference
  lavfi: use avfilter_unref_bufferp() where appropriate.
  vf_fps: add more error checks.
  vf_fps: fix a memleak on malloc failure.
  lavfi: check all ff_start_frame/draw_slice/end_frame calls for errors
  lavfi: add error handling to end_frame().
  lavfi: add error handling to draw_slice().
  lavfi: add error handling to start_frame().

Conflicts:
	Makefile
	ffplay.c
	libavfilter/buffersrc.c
	libavfilter/vf_boxblur.c
	libavfilter/vf_drawtext.c
	libavfilter/vf_fade.c
	libavfilter/vf_frei0r.c
	libavfilter/vf_hflip.c
	libavfilter/vf_overlay.c
	libavfilter/vf_pad.c
	libavfilter/vf_scale.c
	libavfilter/video.c
	libavfilter/vsrc_color.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

common.mak

@@ -54,7 +54,7 @@ COMPILE_S = $(call COMPILE,AS)
 	$(COMPILE_S)
 
 %.ho: %.h
-	$(CC) $(CPPFLAGS) $(CFLAGS) -Wno-unused -c -o $@ -x c $<
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ -x c $<
 
 %.ver: %.v
 	$(Q)sed 's/$$MAJOR/$($(basename $(@F))_VERSION_MAJOR)/' $^ > $@

libavfilter/af_join.c

@@ -248,7 +248,7 @@ static void join_uninit(AVFilterContext *ctx)
 
     for (i = 0; i < ctx->nb_inputs; i++) {
         av_freep(&ctx->input_pads[i].name);
-        avfilter_unref_buffer(s->input_frames[i]);
+        avfilter_unref_bufferp(&s->input_frames[i]);
     }
 
     av_freep(&s->channels);
@@ -402,7 +402,7 @@ static void join_free_buffer(AVFilterBuffer *buf)
         int i;
 
         for (i = 0; i < priv->nb_in_buffers; i++)
-            avfilter_unref_buffer(priv->in_buffers[i]);
+            avfilter_unref_bufferp(&priv->in_buffers[i]);
 
         av_freep(&priv->in_buffers);
         av_freep(&buf->priv);

libavfilter/avfilter.h

@@ -261,8 +261,11 @@ struct AVFilterPad {
      * picture inside the link structure.
      *
      * Input video pads only.
+     *
+     * @return >= 0 on success, a negative AVERROR on error. picref will be
+     * unreferenced by the caller in case of error.
      */
-    void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
+    int (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
 
     /**
      * Callback function to get a video buffer. If NULL, the filter system will
@@ -287,16 +290,20 @@ struct AVFilterPad {
      * in the link structure during start_frame().
      *
      * Input video pads only.
+     *
+     * @return >= 0 on success, a negative AVERROR on error.
      */
-    void (*end_frame)(AVFilterLink *link);
+    int (*end_frame)(AVFilterLink *link);
 
     /**
      * Slice drawing callback. This is where a filter receives video data
      * and should do its processing.
      *
      * Input video pads only.
+     *
+     * @return >= 0 on success, a negative AVERROR on error.
      */
-    void (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
+    int (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
 
     /**
      * Samples filtering callback. This is where a filter receives audio data
@@ -385,7 +392,7 @@ enum AVMediaType avfilter_pad_get_type(AVFilterPad *pads, int pad_idx);
 
 /** default handler for end_frame() for video inputs */
 attribute_deprecated
-void avfilter_default_end_frame(AVFilterLink *link);
+int  avfilter_default_end_frame(AVFilterLink *link);
 
 /**
  * Filter definition. This defines the pads a filter contains, and all the

libavfilter/buffersink.c

@@ -47,20 +47,16 @@ static av_cold void uninit(AVFilterContext *ctx)
         av_audio_fifo_free(sink->audio_fifo);
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *buf)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *buf)
 {
     BufferSinkContext *s = link->dst->priv;
 
 //     av_assert0(!s->cur_buf);
     s->cur_buf    = buf;
     link->cur_buf = NULL;
-};
 
-static int filter_samples(AVFilterLink *link, AVFilterBufferRef *buf)
-{
-    start_frame(link, buf);
     return 0;
-}
+};
 
 int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf)
 {
@@ -166,7 +162,7 @@ AVFilter avfilter_asink_abuffer = {
 
     .inputs    = (const AVFilterPad[]) {{ .name           = "default",
                                           .type           = AVMEDIA_TYPE_AUDIO,
-                                          .filter_samples = filter_samples,
+                                          .filter_samples = start_frame,
                                           .min_perms      = AV_PERM_READ,
                                           .needs_fifo     = 1 },
                                         { .name = NULL }},

libavfilter/buffersrc.c

@@ -382,19 +382,19 @@ static int request_frame(AVFilterLink *link)
 
     switch (link->type) {
     case AVMEDIA_TYPE_VIDEO:
-        ff_start_frame(link, avfilter_ref_buffer(buf, ~0));
-        ff_draw_slice(link, 0, link->h, 1);
-        ff_end_frame(link);
+        if ((ret = ff_start_frame(link, buf)) < 0 ||
+            (ret = ff_draw_slice(link, 0, link->h, 1)) < 0 ||
+            (ret = ff_end_frame(link)) < 0)
+            return ret;
         break;
     case AVMEDIA_TYPE_AUDIO:
-        ret = ff_filter_samples(link, avfilter_ref_buffer(buf, ~0));
+        ret = ff_filter_samples(link, buf);
         break;
     default:
+        avfilter_unref_bufferp(&buf);
         return AVERROR(EINVAL);
     }
 
-    avfilter_unref_buffer(buf);
-
     return ret;
 }
 

libavfilter/f_settb.c

@@ -99,7 +99,7 @@ static int config_output_props(AVFilterLink *outlink)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
@@ -113,7 +113,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
     }
     inlink->cur_buf = NULL;
 
-    ff_start_frame(outlink, picref);
+    return ff_start_frame(outlink, picref);
 }
 
 static int filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)

libavfilter/fifo.c

@@ -65,17 +65,18 @@ static av_cold void uninit(AVFilterContext *ctx)
 
     for (buf = fifo->root.next; buf; buf = tmp) {
         tmp = buf->next;
-        avfilter_unref_buffer(buf->buf);
+        avfilter_unref_bufferp(&buf->buf);
         av_free(buf);
     }
 
-    avfilter_unref_buffer(fifo->buf_out);
+    avfilter_unref_bufferp(&fifo->buf_out);
 }
 
 static int add_to_queue(AVFilterLink *inlink, AVFilterBufferRef *buf)
 {
     FifoContext *fifo = inlink->dst->priv;
 
+    inlink->cur_buf = NULL;
     fifo->last->next = av_mallocz(sizeof(Buf));
     if (!fifo->last->next) {
         avfilter_unref_buffer(buf);
@@ -88,12 +89,6 @@ static int add_to_queue(AVFilterLink *inlink, AVFilterBufferRef *buf)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
-{
-    add_to_queue(inlink, buf);
-    inlink->cur_buf = NULL;
-}
-
 static void queue_pop(FifoContext *s)
 {
     Buf *tmp = s->root.next->next;
@@ -103,9 +98,15 @@ static void queue_pop(FifoContext *s)
     s->root.next = tmp;
 }
 
-static void end_frame(AVFilterLink *inlink) { }
+static int end_frame(AVFilterLink *inlink)
+{
+    return 0;
+}
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
 /**
  * Move data pointers and pts offset samples forward.
@@ -168,6 +169,9 @@ static int return_audio_frame(AVFilterContext *ctx)
             queue_pop(s);
         } else {
             buf_out = avfilter_ref_buffer(head, AV_PERM_READ);
+            if (!buf_out)
+                return AVERROR(ENOMEM);
+
             buf_out->audio->nb_samples = link->request_samples;
             buffer_offset(link, head, link->request_samples);
         }
@@ -240,9 +244,11 @@ static int request_frame(AVFilterLink *outlink)
      * so we don't have to worry about dereferencing it ourselves. */
     switch (outlink->type) {
     case AVMEDIA_TYPE_VIDEO:
-        ff_start_frame(outlink, fifo->root.next->buf);
-        ff_draw_slice (outlink, 0, outlink->h, 1);
-        ff_end_frame  (outlink);
+        if ((ret = ff_start_frame(outlink, fifo->root.next->buf)) < 0 ||
+            (ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0 ||
+            (ret = ff_end_frame(outlink)) < 0)
+            return ret;
+
         queue_pop(fifo);
         break;
     case AVMEDIA_TYPE_AUDIO:
@@ -272,7 +278,7 @@ AVFilter avfilter_vf_fifo = {
     .inputs    = (const AVFilterPad[]) {{ .name            = "default",
                                           .type            = AVMEDIA_TYPE_VIDEO,
                                           .get_video_buffer= ff_null_get_video_buffer,
-                                          .start_frame     = start_frame,
+                                          .start_frame     = add_to_queue,
                                           .draw_slice      = draw_slice,
                                           .end_frame       = end_frame,
                                           .rej_perms       = AV_PERM_REUSE2, },

libavfilter/internal.h

@@ -93,6 +93,9 @@ struct AVFilterPad {
      * picture inside the link structure.
      *
      * Input video pads only.
+     *
+     * @return >= 0 on success, a negative AVERROR on error. picref will be
+     * unreferenced by the caller in case of error.
      */
     void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
 
@@ -119,16 +122,20 @@ struct AVFilterPad {
      * in the link structure during start_frame().
      *
      * Input video pads only.
+     *
+     * @return >= 0 on success, a negative AVERROR on error.
      */
-    void (*end_frame)(AVFilterLink *link);
+    int (*end_frame)(AVFilterLink *link);
 
     /**
      * Slice drawing callback. This is where a filter receives video data
      * and should do its processing.
      *
      * Input video pads only.
+     *
+     * @return >= 0 on success, a negative AVERROR on error.
      */
-    void (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
+    int (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
 
     /**
      * Samples filtering callback. This is where a filter receives audio data

libavfilter/sink_buffer.c

@@ -96,7 +96,7 @@ static av_cold void common_uninit(AVFilterContext *ctx)
     }
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     BufferSinkContext *buf = inlink->dst->priv;
@@ -108,7 +108,7 @@ static void end_frame(AVFilterLink *inlink)
             av_log(ctx, AV_LOG_ERROR,
                    "Cannot buffer more frames. Consume some available frames "
                    "before adding new ones.\n");
-            return;
+            return AVERROR(ENOMEM);
         }
     }
 
@@ -124,6 +124,7 @@ static void end_frame(AVFilterLink *inlink)
                (char *)av_x_if_null(ctx->name, ctx->filter->name));
         buf->warning_limit *= 10;
     }
+    return 0;
 }
 
 void av_buffersink_set_frame_size(AVFilterContext *ctx, unsigned frame_size)

libavfilter/split.c

@@ -63,32 +63,47 @@ static void split_uninit(AVFilterContext *ctx)
         av_freep(&ctx->output_pads[i].name);
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     AVFilterContext *ctx = inlink->dst;
-    int i;
+    int i, ret = 0;
 
-    for (i = 0; i < ctx->nb_outputs; i++)
-        ff_start_frame(ctx->outputs[i],
-                       avfilter_ref_buffer(picref, ~AV_PERM_WRITE));
+    for (i = 0; i < ctx->nb_outputs; i++) {
+        AVFilterBufferRef *buf_out = avfilter_ref_buffer(picref, ~AV_PERM_WRITE);
+        if (!buf_out)
+            return AVERROR(ENOMEM);
+
+        ret = ff_start_frame(ctx->outputs[i], buf_out);
+        if (ret < 0)
+            break;
+    }
+    return ret;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx = inlink->dst;
-    int i;
+    int i, ret = 0;
 
-    for (i = 0; i < ctx->nb_outputs; i++)
-        ff_draw_slice(ctx->outputs[i], y, h, slice_dir);
+    for (i = 0; i < ctx->nb_outputs; i++) {
+        ret = ff_draw_slice(ctx->outputs[i], y, h, slice_dir);
+        if (ret < 0)
+            break;
+    }
+    return ret;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
-    int i;
+    int i, ret = 0;
 
-    for (i = 0; i < ctx->nb_outputs; i++)
-        ff_end_frame(ctx->outputs[i]);
+    for (i = 0; i < ctx->nb_outputs; i++) {
+        ret = ff_end_frame(ctx->outputs[i]);
+        if (ret < 0)
+            break;
+    }
+    return ret;
 }
 
 AVFilter avfilter_vf_split = {
@@ -114,8 +129,14 @@ static int filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
     int i, ret = 0;
 
     for (i = 0; i < ctx->nb_outputs; i++) {
-        ret = ff_filter_samples(inlink->dst->outputs[i],
-                                avfilter_ref_buffer(samplesref, ~AV_PERM_WRITE));
+        AVFilterBufferRef *buf_out = avfilter_ref_buffer(samplesref,
+                                                         ~AV_PERM_WRITE);
+        if (!buf_out) {
+            ret = AVERROR(ENOMEM);
+            break;
+        }
+
+        ret = ff_filter_samples(inlink->dst->outputs[i], buf_out);
         if (ret < 0)
             break;
     }

libavfilter/src_movie.c

@@ -326,13 +326,24 @@ static int movie_request_frame(AVFilterLink *outlink)
         return ret;
 
     outpicref = avfilter_ref_buffer(movie->picref, ~0);
-    ff_start_frame(outlink, outpicref);
-    ff_draw_slice(outlink, 0, outlink->h, 1);
-    ff_end_frame(outlink);
-    avfilter_unref_buffer(movie->picref);
-    movie->picref = NULL;
+    if (!outpicref) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
 
-    return 0;
+    ret = ff_start_frame(outlink, outpicref);
+    if (ret < 0)
+        goto fail;
+
+    ret = ff_draw_slice(outlink, 0, outlink->h, 1);
+    if (ret < 0)
+        goto fail;
+
+    ret = ff_end_frame(outlink);
+fail:
+    avfilter_unref_bufferp(&movie->picref);
+
+    return ret;
 }
 
 AVFilter avfilter_vsrc_movie = {

libavfilter/vf_alphaextract.c

@@ -59,7 +59,7 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
 {
     AlphaExtractContext *extract = inlink->dst->priv;
     AVFilterBufferRef *cur_buf = inlink->cur_buf;
@@ -91,7 +91,7 @@ static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
                    linesize);
         }
     }
-    ff_draw_slice(inlink->dst->outputs[0], y0, h, slice_dir);
+    return ff_draw_slice(inlink->dst->outputs[0], y0, h, slice_dir);
 }
 
 AVFilter avfilter_vf_alphaextract = {

libavfilter/vf_alphamerge.c

@@ -95,8 +95,8 @@ static int config_output(AVFilterLink *outlink)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) {}
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) {}
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) {return 0;}
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) {return 0;}
 
 static void draw_frame(AVFilterContext *ctx,
                        AVFilterBufferRef *main_buf,
@@ -130,7 +130,7 @@ static void draw_frame(AVFilterContext *ctx,
     ff_draw_slice(ctx->outputs[0], 0, h, 1);
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     AlphaMergeContext *merge = ctx->priv;
@@ -157,6 +157,7 @@ static void end_frame(AVFilterLink *inlink)
         ff_end_frame(ctx->outputs[0]);
         avfilter_unref_buffer(alpha_buf);
     }
+    return 0;
 }
 
 static int request_frame(AVFilterLink *outlink)

libavfilter/vf_aspect.c

@@ -51,13 +51,13 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     return 0;
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     AspectContext *aspect = link->dst->priv;
 
     picref->video->sample_aspect_ratio = aspect->ratio;
     link->cur_buf = NULL;
-    ff_start_frame(link->dst->outputs[0], picref);
+    return ff_start_frame(link->dst->outputs[0], picref);
 }
 
 #if CONFIG_SETDAR_FILTER

libavfilter/vf_ass.c

@@ -157,7 +157,7 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
 
 /* libass stores an RGBA color in the format RRGGBBTT, where TT is the transparency level */
 #define AR(c)  ( (c)>>24)
@@ -180,7 +180,7 @@ static void overlay_ass_image(AssContext *ass, AVFilterBufferRef *picref,
     }
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
@@ -197,7 +197,7 @@ static void end_frame(AVFilterLink *inlink)
     overlay_ass_image(ass, picref, image);
 
     ff_draw_slice(outlink, 0, picref->video->h, 1);
-    ff_end_frame(outlink);
+    return ff_end_frame(outlink);
 }
 
 AVFilter avfilter_vf_ass = {

libavfilter/vf_bbox.c

@@ -56,7 +56,7 @@ static int query_formats(AVFilterContext *ctx)
     return 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     BBoxContext *bbox = ctx->priv;
@@ -86,7 +86,7 @@ static void end_frame(AVFilterLink *inlink)
     av_log(ctx, AV_LOG_INFO, "\n");
 
     bbox->frame++;
-    ff_end_frame(inlink->dst->outputs[0]);
+    return ff_end_frame(inlink->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_bbox = {

libavfilter/vf_blackdetect.c

@@ -146,7 +146,7 @@ static int request_frame(AVFilterLink *outlink)
     return ret;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx = inlink->dst;
     BlackDetectContext *blackdetect = ctx->priv;
@@ -160,10 +160,10 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         p += picref->linesize[0];
     }
 
-    ff_draw_slice(ctx->outputs[0], y, h, slice_dir);
+    return ff_draw_slice(ctx->outputs[0], y, h, slice_dir);
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     BlackDetectContext *blackdetect = ctx->priv;
@@ -194,7 +194,7 @@ static void end_frame(AVFilterLink *inlink)
     blackdetect->last_picref_pts = picref->pts;
     blackdetect->frame_count++;
     blackdetect->nb_black_pixels = 0;
-    ff_end_frame(inlink->dst->outputs[0]);
+    return ff_end_frame(inlink->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_blackdetect = {

libavfilter/vf_blackframe.c

@@ -77,7 +77,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     return 0;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx = inlink->dst;
     BlackFrameContext *blackframe = ctx->priv;
@@ -91,10 +91,10 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         p += picref->linesize[0];
     }
 
-    ff_draw_slice(ctx->outputs[0], y, h, slice_dir);
+    return ff_draw_slice(ctx->outputs[0], y, h, slice_dir);
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     BlackFrameContext *blackframe = ctx->priv;
@@ -114,7 +114,7 @@ static void end_frame(AVFilterLink *inlink)
 
     blackframe->frame++;
     blackframe->nblack = 0;
-    ff_end_frame(inlink->dst->outputs[0]);
+    return ff_end_frame(inlink->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_blackframe = {

libavfilter/vf_boxblur.c

@@ -301,9 +301,9 @@ static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_li
                    h, radius, power, temp);
 }
 
-static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { return 0; }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     BoxBlurContext *boxblur = ctx->priv;
@@ -328,7 +328,7 @@ static void end_frame(AVFilterLink *inlink)
               boxblur->temp);
 
     ff_draw_slice(outlink, 0, inlink->h, 1);
-    avfilter_default_end_frame(inlink);
+    return avfilter_default_end_frame(inlink);
 }
 
 AVFilter avfilter_vf_boxblur = {

libavfilter/vf_colormatrix.c

@@ -340,7 +340,7 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int
     return picref;
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     AVFilterContext *ctx = link->dst;
     ColorMatrixContext *color = ctx->priv;
@@ -348,10 +348,10 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 
     color->outpicref = outpicref;
 
-    ff_start_frame(link->dst->outputs[0], outpicref);
+    return ff_start_frame(link->dst->outputs[0], outpicref);
 }
 
-static void end_frame(AVFilterLink *link)
+static int end_frame(AVFilterLink *link)
 {
     AVFilterContext *ctx = link->dst;
     ColorMatrixContext *color = ctx->priv;
@@ -365,10 +365,10 @@ static void end_frame(AVFilterLink *link)
         process_frame_uyvy422(color, out, link->cur_buf);
 
     ff_draw_slice(ctx->outputs[0], 0, link->dst->outputs[0]->h, 1);
-    ff_end_frame(ctx->outputs[0]);
+    return ff_end_frame(ctx->outputs[0]);
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
 
 AVFilter avfilter_vf_colormatrix = {
     .name          = "colormatrix",

libavfilter/vf_crop.c

@@ -259,7 +259,7 @@ static int config_output(AVFilterLink *link)
     return 0;
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     AVFilterContext *ctx = link->dst;
     CropContext *crop = ctx->priv;
@@ -267,6 +267,9 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
     int i;
 
     ref2 = avfilter_ref_buffer(picref, ~0);
+    if (!ref2)
+        return AVERROR(ENOMEM);
+
     ref2->video->w = crop->w;
     ref2->video->h = crop->h;
 
@@ -310,16 +313,16 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
         ref2->data[3] += crop->x * crop->max_step[3];
     }
 
-    ff_start_frame(link->dst->outputs[0], ref2);
+    return ff_start_frame(link->dst->outputs[0], ref2);
 }
 
-static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx = link->dst;
     CropContext *crop = ctx->priv;
 
     if (y >= crop->y + crop->h || y + h <= crop->y)
-        return;
+        return 0;
 
     if (y < crop->y) {
         h -= crop->y - y;
@@ -328,15 +331,15 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     if (y + h > crop->y + crop->h)
         h = crop->y + crop->h - y;
 
-    ff_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
+    return ff_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
 }
 
-static void end_frame(AVFilterLink *link)
+static int end_frame(AVFilterLink *link)
 {
     CropContext *crop = link->dst->priv;
 
     crop->var_values[VAR_N] += 1.0;
-    ff_end_frame(link->dst->outputs[0]);
+    return ff_end_frame(link->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_crop = {

libavfilter/vf_cropdetect.c

@@ -114,7 +114,7 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     CropDetectContext *cd = ctx->priv;
@@ -191,7 +191,7 @@ static void end_frame(AVFilterLink *inlink)
                w, h, x, y);
     }
 
-    ff_end_frame(inlink->dst->outputs[0]);
+    return ff_end_frame(inlink->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_cropdetect = {

libavfilter/vf_delogo.c

@@ -209,27 +209,48 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
     AVFilterLink *outlink = inlink->dst->outputs[0];
-    AVFilterBufferRef *outpicref;
+    AVFilterBufferRef *outpicref = NULL, *for_next_filter;
+    int ret = 0;
 
     if (inpicref->perms & AV_PERM_PRESERVE) {
         outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE,
                                         outlink->w, outlink->h);
+        if (!outpicref)
+            return AVERROR(ENOMEM);
+
         avfilter_copy_buffer_ref_props(outpicref, inpicref);
         outpicref->video->w = outlink->w;
         outpicref->video->h = outlink->h;
-    } else
+    } else {
         outpicref = avfilter_ref_buffer(inpicref, ~0);
+        if (!outpicref)
+            return AVERROR(ENOMEM);
+    }
+
+    for_next_filter = avfilter_ref_buffer(outpicref, ~0);
+    if (for_next_filter)
+        ret = ff_start_frame(outlink, for_next_filter);
+    else
+        ret = AVERROR(ENOMEM);
+
+    if (ret < 0) {
+        avfilter_unref_bufferp(&outpicref);
+        return ret;
+    }
 
     outlink->out_buf = outpicref;
-    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     DelogoContext *delogo = inlink->dst->priv;
     AVFilterLink *outlink = inlink->dst->outputs[0];
@@ -239,6 +260,7 @@ static void end_frame(AVFilterLink *inlink)
     int hsub0 = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
     int vsub0 = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
     int plane;
+    int ret;
 
     for (plane = 0; plane < 4 && inpicref->data[plane]; plane++) {
         int hsub = plane == 1 || plane == 2 ? hsub0 : 0;
@@ -253,8 +275,10 @@ static void end_frame(AVFilterLink *inlink)
                      delogo->show, direct);
     }
 
-    ff_draw_slice(outlink, 0, inlink->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_draw_slice(outlink, 0, inlink->h, 1)) < 0 ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
+    return 0;
 }
 
 AVFilter avfilter_vf_delogo = {

libavfilter/vf_deshake.c

@@ -425,7 +425,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     av_freep(&deshake->avctx);
 }
 
-static void end_frame(AVFilterLink *link)
+static int end_frame(AVFilterLink *link)
 {
     DeshakeContext *deshake = link->dst->priv;
     AVFilterBufferRef *in  = link->cur_buf;
@@ -529,11 +529,12 @@ static void end_frame(AVFilterLink *link)
 
     // Draw the transformed frame information
     ff_draw_slice(link->dst->outputs[0], 0, link->h, 1);
-    ff_end_frame(link->dst->outputs[0]);
+    return ff_end_frame(link->dst->outputs[0]);
 }
 
-static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
+    return 0;
 }
 
 AVFilter avfilter_vf_deshake = {

libavfilter/vf_drawbox.c

@@ -94,7 +94,7 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
 {
     DrawBoxContext *drawbox = inlink->dst->priv;
     int plane, x, y, xb = drawbox->x, yb = drawbox->y;
@@ -120,7 +120,7 @@ static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
         }
     }
 
-    ff_draw_slice(inlink->dst->outputs[0], y0, h, 1);
+    return ff_draw_slice(inlink->dst->outputs[0], y0, h, 1);
 }
 
 AVFilter avfilter_vf_drawbox = {

libavfilter/vf_drawtext.c

@@ -780,14 +780,18 @@ static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
     DrawTextContext *dtext = ctx->priv;
     AVFilterBufferRef *picref = inlink->cur_buf;
+    int ret;
 
     dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
         NAN : picref->pts * av_q2d(inlink->time_base);
@@ -801,8 +805,10 @@ static void end_frame(AVFilterLink *inlink)
 
     dtext->var_values[VAR_N] += 1.0;
 
-    ff_draw_slice(outlink, 0, picref->video->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_draw_slice(outlink, 0, picref->video->h, 1)) < 0 ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
+    return 0;
 }
 
 AVFilter avfilter_vf_drawtext = {

libavfilter/vf_fade.c

@@ -214,7 +214,7 @@ static void fade_plane(int y, int h, int w,
     }
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     FadeContext *fade = inlink->dst->priv;
     AVFilterBufferRef *outpic = inlink->cur_buf;
@@ -255,20 +255,23 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
     }
 
-    ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+    return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     FadeContext *fade = inlink->dst->priv;
+    int ret;
 
-    ff_end_frame(inlink->dst->outputs[0]);
+    ret = ff_end_frame(inlink->dst->outputs[0]);
 
     if (fade->frame_index >= fade->start_frame &&
         fade->frame_index <= fade->stop_frame)
         fade->factor += fade->fade_per_frame;
     fade->factor = av_clip_uint16(fade->factor);
     fade->frame_index++;
+
+    return ret;
 }
 
 AVFilter avfilter_vf_fade = {

libavfilter/vf_fieldorder.c

@@ -116,21 +116,35 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int
     return ff_get_video_buffer(outlink, perms, w, h);
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
     AVFilterContext   *ctx        = inlink->dst;
     AVFilterLink      *outlink    = ctx->outputs[0];
 
     AVFilterBufferRef *outpicref, *for_next_filter;
+    int ret = 0;
 
     outpicref = avfilter_ref_buffer(inpicref, ~0);
-    outlink->out_buf = outpicref;
+    if (!outpicref)
+        return AVERROR(ENOMEM);
 
     for_next_filter = avfilter_ref_buffer(outpicref, ~0);
-    ff_start_frame(outlink, for_next_filter);
+    if (!for_next_filter) {
+        avfilter_unref_bufferp(&outpicref);
+        return AVERROR(ENOMEM);
+    }
+
+    ret = ff_start_frame(outlink, for_next_filter);
+    if (ret < 0) {
+        avfilter_unref_bufferp(&outpicref);
+        return ret;
+    }
+
+    outlink->out_buf = outpicref;
+    return 0;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterContext   *ctx        = inlink->dst;
     FieldOrderContext *fieldorder = ctx->priv;
@@ -144,11 +158,12 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
      *  and that complexity will be added later */
     if (  !inpicref->video->interlaced
         || inpicref->video->top_field_first == fieldorder->dst_tff) {
-        ff_draw_slice(outlink, y, h, slice_dir);
+        return ff_draw_slice(outlink, y, h, slice_dir);
     }
+    return 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext   *ctx        = inlink->dst;
     FieldOrderContext *fieldorder = ctx->priv;
@@ -212,7 +227,7 @@ static void end_frame(AVFilterLink *inlink)
                 "not interlaced or field order already correct\n");
     }
 
-    ff_end_frame(outlink);
+    return ff_end_frame(outlink);
 }
 
 AVFilter avfilter_vf_fieldorder = {

libavfilter/vf_fps.c

@@ -143,9 +143,11 @@ static int request_frame(AVFilterLink *outlink)
             buf->pts = av_rescale_q(s->first_pts, ctx->inputs[0]->time_base,
                                     outlink->time_base) + s->frames_out;
 
-            ff_start_frame(outlink, buf);
-            ff_draw_slice(outlink, 0, outlink->h, 1);
-            ff_end_frame(outlink);
+            if ((ret = ff_start_frame(outlink, buf)) < 0 ||
+                (ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0 ||
+                (ret = ff_end_frame(outlink)) < 0)
+                return ret;
+
             s->frames_out++;
         }
         return 0;
@@ -159,28 +161,33 @@ static int write_to_fifo(AVFifoBuffer *fifo, AVFilterBufferRef *buf)
     int ret;
 
     if (!av_fifo_space(fifo) &&
-        (ret = av_fifo_realloc2(fifo, 2*av_fifo_size(fifo))))
+        (ret = av_fifo_realloc2(fifo, 2*av_fifo_size(fifo)))) {
+        avfilter_unref_bufferp(&buf);
         return ret;
+    }
 
     av_fifo_generic_write(fifo, &buf, sizeof(buf), NULL);
     return 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext    *ctx = inlink->dst;
     FPSContext           *s = ctx->priv;
     AVFilterLink   *outlink = ctx->outputs[0];
     AVFilterBufferRef  *buf = inlink->cur_buf;
     int64_t delta;
-    int i;
+    int i, ret;
 
     inlink->cur_buf = NULL;
     s->frames_in++;
     /* discard frames until we get the first timestamp */
     if (s->pts == AV_NOPTS_VALUE) {
         if (buf->pts != AV_NOPTS_VALUE) {
-            write_to_fifo(s->fifo, buf);
+            ret = write_to_fifo(s->fifo, buf);
+            if (ret < 0)
+                return ret;
+
             s->first_pts = s->pts = buf->pts;
         } else {
             av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no "
@@ -188,13 +195,12 @@ static void end_frame(AVFilterLink *inlink)
             avfilter_unref_buffer(buf);
             s->drop++;
         }
-        return;
+        return 0;
     }
 
     /* now wait for the next timestamp */
     if (buf->pts == AV_NOPTS_VALUE) {
-        write_to_fifo(s->fifo, buf);
-        return;
+        return write_to_fifo(s->fifo, buf);
     }
 
     /* number of output frames */
@@ -211,10 +217,10 @@ static void end_frame(AVFilterLink *inlink)
 
         av_fifo_generic_read(s->fifo, &tmp, sizeof(tmp), NULL);
         flush_fifo(s->fifo);
-        write_to_fifo(s->fifo, tmp);
+        ret = write_to_fifo(s->fifo, tmp);
 
         avfilter_unref_buffer(buf);
-        return;
+        return ret;
     }
 
     /* can output >= 1 frames */
@@ -224,31 +230,51 @@ static void end_frame(AVFilterLink *inlink)
 
         /* duplicate the frame if needed */
         if (!av_fifo_size(s->fifo) && i < delta - 1) {
+            AVFilterBufferRef *dup = avfilter_ref_buffer(buf_out, AV_PERM_READ);
+
             av_log(ctx, AV_LOG_DEBUG, "Duplicating frame.\n");
-            write_to_fifo(s->fifo, avfilter_ref_buffer(buf_out, AV_PERM_READ));
+            if (dup)
+                ret = write_to_fifo(s->fifo, dup);
+            else
+                ret = AVERROR(ENOMEM);
+
+            if (ret < 0) {
+                avfilter_unref_bufferp(&buf_out);
+                avfilter_unref_bufferp(&buf);
+                return ret;
+            }
+
             s->dup++;
         }
 
         buf_out->pts = av_rescale_q(s->first_pts, inlink->time_base,
                                     outlink->time_base) + s->frames_out;
 
-        ff_start_frame(outlink, buf_out);
-        ff_draw_slice(outlink, 0, outlink->h, 1);
-        ff_end_frame(outlink);
+        if ((ret = ff_start_frame(outlink, buf_out)) < 0 ||
+            (ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0 ||
+            (ret = ff_end_frame(outlink)) < 0) {
+            avfilter_unref_bufferp(&buf);
+            return ret;
+        }
+
         s->frames_out++;
     }
     flush_fifo(s->fifo);
 
-    write_to_fifo(s->fifo, buf);
+    ret = write_to_fifo(s->fifo, buf);
     s->pts = s->first_pts + av_rescale_q(s->frames_out, outlink->time_base, inlink->time_base);
+
+    return ret;
 }
 
-static void null_start_frame(AVFilterLink *link, AVFilterBufferRef *buf)
+static int null_start_frame(AVFilterLink *link, AVFilterBufferRef *buf)
 {
+    return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
+    return 0;
 }
 
 AVFilter avfilter_vf_fps = {

libavfilter/vf_frei0r.c

@@ -340,20 +340,26 @@ static int query_formats(AVFilterContext *ctx)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     Frei0rContext *frei0r = inlink->dst->priv;
     AVFilterLink *outlink = inlink->dst->outputs[0];
     AVFilterBufferRef  *inpicref =  inlink->cur_buf;
     AVFilterBufferRef *outpicref = outlink->out_buf;
+    int ret;
 
     frei0r->update(frei0r->instance, inpicref->pts * av_q2d(inlink->time_base) * 1000,
                    (const uint32_t *)inpicref->data[0],
                    (uint32_t *)outpicref->data[0]);
-    ff_draw_slice(outlink, 0, outlink->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_draw_slice(outlink, 0, outlink->h, 1)) ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
+    return 0;
 }
 
 AVFilter avfilter_vf_frei0r = {
@@ -432,18 +438,38 @@ static int source_request_frame(AVFilterLink *outlink)
 {
     Frei0rContext *frei0r = outlink->src->priv;
     AVFilterBufferRef *picref = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+    AVFilterBufferRef *buf_out;
+    int ret;
+
+    if (!picref)
+        return AVERROR(ENOMEM);
+
     picref->video->sample_aspect_ratio = (AVRational) {1, 1};
     picref->pts = frei0r->pts++;
     picref->pos = -1;
 
-    ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
+    buf_out = avfilter_ref_buffer(picref, ~0);
+    if (!buf_out) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    ret = ff_start_frame(outlink, buf_out);
+    if (ret < 0)
+        goto fail;
+
     frei0r->update(frei0r->instance, av_rescale_q(picref->pts, frei0r->time_base, (AVRational){1,1000}),
                    NULL, (uint32_t *)picref->data[0]);
-    ff_draw_slice(outlink, 0, outlink->h, 1);
-    ff_end_frame(outlink);
+    ret = ff_draw_slice(outlink, 0, outlink->h, 1);
+    if (ret < 0)
+        goto fail;
+
+    ret = ff_end_frame(outlink);
+
+fail:
     avfilter_unref_buffer(picref);
 
-    return 0;
+    return ret;
 }
 
 AVFilter avfilter_vsrc_frei0r_src = {

libavfilter/vf_gradfun.c

@@ -180,32 +180,53 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
     AVFilterLink *outlink = inlink->dst->outputs[0];
-    AVFilterBufferRef *outpicref;
+    AVFilterBufferRef *outpicref = NULL, *for_next_filter;
+    int ret = 0;
 
     if (inpicref->perms & AV_PERM_PRESERVE) {
         outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+        if (!outpicref)
+            return AVERROR(ENOMEM);
+
         avfilter_copy_buffer_ref_props(outpicref, inpicref);
         outpicref->video->w = outlink->w;
         outpicref->video->h = outlink->h;
-    } else
+    } else {
         outpicref = avfilter_ref_buffer(inpicref, ~0);
+        if (!outpicref)
+            return AVERROR(ENOMEM);
+    }
+
+    for_next_filter = avfilter_ref_buffer(outpicref, ~0);
+    if (for_next_filter)
+        ret = ff_start_frame(outlink, for_next_filter);
+    else
+        ret = AVERROR(ENOMEM);
+
+    if (ret < 0) {
+        avfilter_unref_bufferp(&outpicref);
+        return ret;
+    }
 
     outlink->out_buf = outpicref;
-    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     GradFunContext *gf = inlink->dst->priv;
     AVFilterBufferRef *inpic = inlink->cur_buf;
     AVFilterLink *outlink = inlink->dst->outputs[0];
     AVFilterBufferRef *outpic = outlink->out_buf;
-    int p;
+    int p, ret;
 
     for (p = 0; p < 4 && inpic->data[p]; p++) {
         int w = inlink->w;
@@ -223,8 +244,10 @@ static void end_frame(AVFilterLink *inlink)
             av_image_copy_plane(outpic->data[p], outpic->linesize[p], inpic->data[p], inpic->linesize[p], w, h);
     }
 
-    ff_draw_slice(outlink, 0, inlink->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_draw_slice(outlink, 0, inlink->h, 1)) < 0 ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
+    return 0;
 }
 
 AVFilter avfilter_vf_gradfun = {

libavfilter/vf_hflip.c

@@ -83,7 +83,7 @@ static int config_props(AVFilterLink *inlink)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     AVFilterLink *outlink = inlink->dst->outputs[0];
 
@@ -95,10 +95,10 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
     if (av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PAL)
         memcpy(inlink->dst->outputs[0]->out_buf->data[1], picref->data[1], AVPALETTE_SIZE);
 
-    ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+    return ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     FlipContext *flip = inlink->dst->priv;
     AVFilterBufferRef *inpic  = inlink->cur_buf;
@@ -159,7 +159,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
     }
 
-    ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+    return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
 }
 
 AVFilter avfilter_vf_hflip = {

libavfilter/vf_hqdn3d.c

@@ -290,9 +290,12 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     HQDN3DContext *hqdn3d = inlink->dst->priv;
     AVFilterLink *outlink = inlink->dst->outputs[0];
@@ -300,6 +303,7 @@ static void end_frame(AVFilterLink *inlink)
     AVFilterBufferRef *outpic = outlink->out_buf;
     int cw = inpic->video->w >> hqdn3d->hsub;
     int ch = inpic->video->h >> hqdn3d->vsub;
+    int ret;
 
     deNoise(inpic->data[0], outpic->data[0],
             hqdn3d->Line, &hqdn3d->Frame[0], inpic->video->w, inpic->video->h,
@@ -320,8 +324,10 @@ static void end_frame(AVFilterLink *inlink)
             hqdn3d->Coefs[2],
             hqdn3d->Coefs[3]);
 
-    ff_draw_slice(outlink, 0, inpic->video->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_draw_slice(outlink, 0, inpic->video->h, 1)) < 0 ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
+    return 0;
 }
 
 AVFilter avfilter_vf_hqdn3d = {

libavfilter/vf_idet.c

@@ -169,7 +169,7 @@ static void filter(AVFilterContext *ctx)
     av_log(ctx, AV_LOG_DEBUG, "Single frame:%s, Multi frame:%s\n", type2str(type), type2str(idet->last_type));
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     AVFilterContext *ctx = link->dst;
     IDETContext *idet = ctx->priv;
@@ -181,21 +181,21 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
     idet->next = picref;
 
     if (!idet->cur)
-        return;
+        return 0;
 
     if (!idet->prev)
         idet->prev = avfilter_ref_buffer(idet->cur, AV_PERM_READ);
 
-    ff_start_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, AV_PERM_READ));
+    return ff_start_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, AV_PERM_READ));
 }
 
-static void end_frame(AVFilterLink *link)
+static int end_frame(AVFilterLink *link)
 {
     AVFilterContext *ctx = link->dst;
     IDETContext *idet = ctx->priv;
 
     if (!idet->cur)
-        return;
+        return 0;
 
     if (!idet->csp)
         idet->csp = &av_pix_fmt_descriptors[link->format];
@@ -205,7 +205,7 @@ static void end_frame(AVFilterLink *link)
     filter(ctx);
 
     ff_draw_slice(ctx->outputs[0], 0, link->h, 1);
-    ff_end_frame(ctx->outputs[0]);
+    return ff_end_frame(ctx->outputs[0]);
 }
 
 static int request_frame(AVFilterLink *link)
@@ -311,7 +311,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
 
 AVFilter avfilter_vf_idet = {
     .name          = "idet",

libavfilter/vf_libopencv.c

@@ -67,7 +67,10 @@ static int query_formats(AVFilterContext *ctx)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
 typedef struct {
     const char *name;
@@ -351,7 +354,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     memset(ocv, 0, sizeof(*ocv));
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     OCVContext *ocv = ctx->priv;
@@ -359,14 +362,17 @@ static void end_frame(AVFilterLink *inlink)
     AVFilterBufferRef *inpicref  = inlink ->cur_buf;
     AVFilterBufferRef *outpicref = outlink->out_buf;
     IplImage inimg, outimg;
+    int ret;
 
     fill_iplimage_from_picref(&inimg , inpicref , inlink->format);
     fill_iplimage_from_picref(&outimg, outpicref, inlink->format);
     ocv->end_frame_filter(ctx, &inimg, &outimg);
     fill_picref_from_iplimage(outpicref, &outimg, inlink->format);
 
-    ff_draw_slice(outlink, 0, outlink->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0 ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
+    return 0;
 }
 
 AVFilter avfilter_vf_ocv = {

libavfilter/vf_lut.c

@@ -275,7 +275,7 @@ static int config_props(AVFilterLink *inlink)
     return 0;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx = inlink->dst;
     LutContext *lut = ctx->priv;
@@ -332,7 +332,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
     }
 
-    ff_draw_slice(outlink, y, h, slice_dir);
+    return ff_draw_slice(outlink, y, h, slice_dir);
 }
 
 static const AVFilterPad inputs[] = {

libavfilter/vf_mp.c

@@ -848,15 +848,17 @@ static int request_frame(AVFilterLink *outlink)
     return ret;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
+    return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
+    return 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     MPContext *m = inlink->dst->priv;
     AVFilterBufferRef *inpic  = inlink->cur_buf;
@@ -883,6 +885,7 @@ static void end_frame(AVFilterLink *inlink)
         av_log(m->avfctx, AV_LOG_DEBUG, "put_image() says skip\n");
     }
     free_mp_image(mpi);
+    return 0;
 }
 
 AVFilter avfilter_vf_mp = {

libavfilter/vf_overlay.c

@@ -145,8 +145,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     av_freep(&over->x_expr);
     av_freep(&over->y_expr);
 
-    if (over->overpicref)
-        avfilter_unref_bufferp(&over->overpicref);
+    avfilter_unref_bufferp(&over->overpicref);
     ff_bufqueue_discard_all(&over->queue_main);
     ff_bufqueue_discard_all(&over->queue_over);
 }
@@ -506,7 +505,7 @@ static void flush_frames(AVFilterContext *ctx)
     while (!try_push_frame(ctx));
 }
 
-static void start_frame_main(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame_main(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
     AVFilterContext *ctx = inlink->dst;
     OverlayContext *over = ctx->priv;
@@ -519,9 +518,10 @@ static void start_frame_main(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
         av_assert1(inpicref == inlink->cur_buf);
         inlink->cur_buf = NULL;
     }
+    return 0;
 }
 
-static void draw_slice_main(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice_main(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx = inlink->dst;
     OverlayContext *over = ctx->priv;
@@ -536,10 +536,10 @@ static void draw_slice_main(AVFilterLink *inlink, int y, int h, int slice_dir)
                     over->overpicref->video->w, over->overpicref->video->h,
                     y, outpicref->video->w, h);
     }
-    ff_draw_slice(outlink, y, h, slice_dir);
+    return ff_draw_slice(outlink, y, h, slice_dir);
 }
 
-static void end_frame_main(AVFilterLink *inlink)
+static int end_frame_main(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
@@ -547,15 +547,16 @@ static void end_frame_main(AVFilterLink *inlink)
     flush_frames(ctx);
 
     if (!outpicref)
-        return;
-    ff_end_frame(ctx->outputs[0]);
+        return 0;
+    return ff_end_frame(ctx->outputs[0]);
 }
 
-static void start_frame_over(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame_over(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
+    return 0;
 }
 
-static void end_frame_over(AVFilterLink *inlink)
+static int end_frame_over(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     OverlayContext *over = ctx->priv;
@@ -566,7 +567,7 @@ static void end_frame_over(AVFilterLink *inlink)
     inpicref->pts = av_rescale_q(inpicref->pts, ctx->inputs[OVERLAY]->time_base,
                                  ctx->outputs[0]->time_base);
     ff_bufqueue_add(ctx, &over->queue_over, inpicref);
-    try_push_frame(ctx);
+    return try_push_frame(ctx);
 }
 
 static int request_frame(AVFilterLink *outlink)
@@ -597,7 +598,10 @@ static int request_frame(AVFilterLink *outlink)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
 AVFilter avfilter_vf_overlay = {
     .name      = "overlay",

libavfilter/vf_pad.c

@@ -226,6 +226,9 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int
                                                     h + (pad->h - pad->in_h));
     int plane;
 
+    if (!picref)
+        return NULL;
+
     picref->video->w = w;
     picref->video->h = h;
 
@@ -259,12 +262,15 @@ static int does_clip(PadContext *pad, AVFilterBufferRef *outpicref, int plane, i
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
     PadContext *pad = inlink->dst->priv;
     AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
     AVFilterBufferRef *for_next_filter;
-    int plane;
+    int plane, ret = 0;
+
+    if (!outpicref)
+        return AVERROR(ENOMEM);
 
     for (plane = 0; plane < 4 && outpicref->data[plane] && pad->draw.pixelstep[plane]; plane++) {
         int hsub = pad->draw.hsub[plane];
@@ -292,22 +298,37 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
         outpicref = ff_get_video_buffer(inlink->dst->outputs[0], AV_PERM_WRITE | AV_PERM_NEG_LINESIZES,
                                         FFMAX(inlink->w, pad->w),
                                         FFMAX(inlink->h, pad->h));
+        if (!outpicref)
+            return AVERROR(ENOMEM);
+
         avfilter_copy_buffer_ref_props(outpicref, inpicref);
     }
 
-    inlink->dst->outputs[0]->out_buf = outpicref;
-
     outpicref->video->w = pad->w;
     outpicref->video->h = pad->h;
 
     for_next_filter = avfilter_ref_buffer(outpicref, ~0);
-    ff_start_frame(inlink->dst->outputs[0], for_next_filter);
+    if (!for_next_filter) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    ret = ff_start_frame(inlink->dst->outputs[0], for_next_filter);
+    if (ret < 0)
+        goto fail;
+
+    inlink->dst->outputs[0]->out_buf = outpicref;
+    return 0;
+
+fail:
+    avfilter_unref_bufferp(&outpicref);
+    return ret;
 }
 
-static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
+static int draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
 {
     PadContext *pad = link->dst->priv;
-    int bar_y, bar_h = 0;
+    int bar_y, bar_h = 0, ret = 0;
 
     if        (slice_dir * before_slice ==  1 && y == pad->y) {
         /* top bar */
@@ -324,15 +345,17 @@ static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir,
                           link->dst->outputs[0]->out_buf->data,
                           link->dst->outputs[0]->out_buf->linesize,
                           0, bar_y, pad->w, bar_h);
-        ff_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
+        ret = ff_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
     }
+    return ret;
 }
 
-static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     PadContext *pad = link->dst->priv;
     AVFilterBufferRef *outpic = link->dst->outputs[0]->out_buf;
     AVFilterBufferRef *inpic = link->cur_buf;
+    int ret;
 
     y += pad->y;
 
@@ -340,7 +363,7 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     h = ff_draw_round_to_sub(&pad->draw, 1, -1, h);
 
     if (!h)
-        return;
+        return 0;
     draw_send_bar_slice(link, y, h, slice_dir, 1);
 
     /* left border */
@@ -357,9 +380,11 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     /* right border */
     ff_fill_rectangle(&pad->draw, &pad->color, outpic->data, outpic->linesize,
                       pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
-    ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+    ret = ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+    if (ret < 0)
+        return ret;
 
-    draw_send_bar_slice(link, y, h, slice_dir, -1);
+    return draw_send_bar_slice(link, y, h, slice_dir, -1);
 }
 
 AVFilter avfilter_vf_pad = {

libavfilter/vf_pixdesctest.c

@@ -51,16 +51,18 @@ static int config_props(AVFilterLink *inlink)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     PixdescTestContext *priv = inlink->dst->priv;
     AVFilterLink *outlink    = inlink->dst->outputs[0];
-    AVFilterBufferRef *outpicref;
-    int i;
+    AVFilterBufferRef *outpicref, *for_next_filter;
+    int i, ret = 0;
+
+    outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE,
+                                    outlink->w, outlink->h);
+    if (!outpicref)
+        return AVERROR(ENOMEM);
 
-    outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
-                                           outlink->w, outlink->h);
-    outpicref = outlink->out_buf;
     avfilter_copy_buffer_ref_props(outpicref, picref);
 
     for (i = 0; i < 4; i++) {
@@ -78,10 +80,22 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
         priv->pix_desc->flags & PIX_FMT_PSEUDOPAL)
         memcpy(outpicref->data[1], picref->data[1], AVPALETTE_SIZE);
 
-    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    for_next_filter = avfilter_ref_buffer(outpicref, ~0);
+    if (for_next_filter)
+        ret = ff_start_frame(outlink, for_next_filter);
+    else
+        ret = AVERROR(ENOMEM);
+
+    if (ret < 0) {
+        avfilter_unref_bufferp(&outpicref);
+        return ret;
+    }
+
+    outlink->out_buf = outpicref;
+    return 0;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     PixdescTestContext *priv = inlink->dst->priv;
     AVFilterBufferRef *inpic    = inlink->cur_buf;
@@ -108,7 +122,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
     }
 
-    ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+    return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
 }
 
 AVFilter avfilter_vf_pixdesctest = {

libavfilter/vf_removelogo.c

@@ -472,7 +472,7 @@ static void blur_image(int ***mask,
     }
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
     AVFilterLink *outlink = inlink->dst->outputs[0];
     AVFilterBufferRef *outpicref;
@@ -487,10 +487,10 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
         outpicref = inpicref;
 
     outlink->out_buf = outpicref;
-    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    return ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     RemovelogoContext *removelogo = inlink->dst->priv;
     AVFilterLink *outlink = inlink->dst->outputs[0];
@@ -515,7 +515,7 @@ static void end_frame(AVFilterLink *inlink)
                inlink->w/2, inlink->h/2, direct, &removelogo->half_mask_bbox);
 
     ff_draw_slice(outlink, 0, inlink->h, 1);
-    ff_end_frame(outlink);
+    return ff_end_frame(outlink);
 }
 
 static void uninit(AVFilterContext *ctx)
@@ -540,7 +540,7 @@ static void uninit(AVFilterContext *ctx)
     }
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
 
 AVFilter avfilter_vf_removelogo = {
     .name          = "removelogo",

libavfilter/vf_scale.c

@@ -272,11 +272,12 @@ fail:
     return ret;
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     ScaleContext *scale = link->dst->priv;
     AVFilterLink *outlink = link->dst->outputs[0];
-    AVFilterBufferRef *outpicref;
+    AVFilterBufferRef *outpicref, *for_next_filter;
+    int ret = 0;
 
     if(   picref->video->w != link->w
        || picref->video->h != link->h
@@ -295,19 +296,23 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 
 
     if (!scale->sws) {
-        ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
-        return;
+        outpicref = avfilter_ref_buffer(picref, ~0);
+        if (!outpicref)
+            return AVERROR(ENOMEM);
+        return ff_start_frame(outlink, outpicref);
     }
 
     scale->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
     scale->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
 
     outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_ALIGN, outlink->w, outlink->h);
+    if (!outpicref)
+        return AVERROR(ENOMEM);
+
     avfilter_copy_buffer_ref_props(outpicref, picref);
     outpicref->video->w = outlink->w;
     outpicref->video->h = outlink->h;
 
-    outlink->out_buf = outpicref;
     if(scale->output_is_pal)
         ff_set_systematic_pal2(outpicref->data[1], outlink->format == PIX_FMT_PAL8 ? PIX_FMT_BGR8 : outlink->format);
 
@@ -317,7 +322,19 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
               INT_MAX);
 
     scale->slice_y = 0;
-    ff_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+    for_next_filter = avfilter_ref_buffer(outpicref, ~0);
+    if (for_next_filter)
+        ret = ff_start_frame(outlink, for_next_filter);
+    else
+        ret = AVERROR(ENOMEM);
+
+    if (ret < 0) {
+        avfilter_unref_bufferp(&outpicref);
+        return ret;
+    }
+
+    outlink->out_buf = outpicref;
+    return 0;
 }
 
 static int scale_slice(AVFilterLink *link, struct SwsContext *sws, int y, int h, int mul, int field)
@@ -346,14 +363,13 @@ static int scale_slice(AVFilterLink *link, struct SwsContext *sws, int y, int h,
                          out,out_stride);
 }
 
-static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     ScaleContext *scale = link->dst->priv;
-    int out_h;
+    int out_h, ret;
 
     if (!scale->sws) {
-        ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
-        return;
+        return ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
     }
 
     if (scale->slice_y == 0 && slice_dir == -1)
@@ -369,9 +385,10 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 
     if (slice_dir == -1)
         scale->slice_y -= out_h;
-    ff_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
+    ret = ff_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
     if (slice_dir == 1)
         scale->slice_y += out_h;
+    return ret;
 }
 
 AVFilter avfilter_vf_scale = {

libavfilter/vf_select.c

@@ -269,12 +269,13 @@ static int select_frame(AVFilterContext *ctx, AVFilterBufferRef *picref)
     return res;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     SelectContext *select = inlink->dst->priv;
 
     select->select = select_frame(inlink->dst, picref);
     if (select->select) {
+        AVFilterBufferRef *buf_out;
         /* frame was requested through poll_frame */
         if (select->cache_frames) {
             if (!av_fifo_space(select->pending_frames))
@@ -283,29 +284,36 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
             else
                 av_fifo_generic_write(select->pending_frames, &picref,
                                       sizeof(picref), NULL);
-            return;
+            return 0;
         }
-        ff_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
+        buf_out = avfilter_ref_buffer(picref, ~0);
+        if (!buf_out)
+            return AVERROR(ENOMEM);
+        return ff_start_frame(inlink->dst->outputs[0], buf_out);
     }
+
+    return 0;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     SelectContext *select = inlink->dst->priv;
 
     if (select->select && !select->cache_frames)
-        ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+        return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+    return 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     SelectContext *select = inlink->dst->priv;
 
     if (select->select) {
         if (select->cache_frames)
-            return;
-        ff_end_frame(inlink->dst->outputs[0]);
+            return 0;
+        return ff_end_frame(inlink->dst->outputs[0]);
     }
+    return 0;
 }
 
 static int request_frame(AVFilterLink *outlink)
@@ -317,12 +325,14 @@ static int request_frame(AVFilterLink *outlink)
 
     if (av_fifo_size(select->pending_frames)) {
         AVFilterBufferRef *picref;
+        int ret;
+
         av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL);
-        ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
-        ff_draw_slice(outlink, 0, outlink->h, 1);
-        ff_end_frame(outlink);
-        avfilter_unref_buffer(picref);
-        return 0;
+        if ((ret = ff_start_frame(outlink, picref)) < 0 ||
+            (ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0 ||
+            (ret = ff_end_frame(outlink)) < 0);
+
+        return ret;
     }
 
     while (!select->select) {

libavfilter/vf_setfield.c

@@ -69,7 +69,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
     SetFieldContext *setfield = inlink->dst->priv;
     AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
@@ -80,7 +80,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
         outpicref->video->interlaced = 1;
         outpicref->video->top_field_first = setfield->mode;
     }
-    ff_start_frame(inlink->dst->outputs[0], outpicref);
+    return ff_start_frame(inlink->dst->outputs[0], outpicref);
 }
 
 AVFilter avfilter_vf_setfield = {

libavfilter/vf_setpts.c

@@ -92,12 +92,15 @@ static int config_input(AVFilterLink *inlink)
 #define D2TS(d)  (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
 #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 {
     SetPTSContext *setpts = inlink->dst->priv;
     double d;
     AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
 
+    if (!outpicref)
+        return AVERROR(ENOMEM);
+
     if (isnan(setpts->var_values[VAR_STARTPTS]))
         setpts->var_values[VAR_STARTPTS] = TS2D(inpicref->pts);
 
@@ -121,7 +124,7 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
     setpts->var_values[VAR_N] += 1.0;
     setpts->var_values[VAR_PREV_INPTS ] = TS2D(inpicref ->pts);
     setpts->var_values[VAR_PREV_OUTPTS] = TS2D(outpicref->pts);
-    ff_start_frame(inlink->dst->outputs[0], outpicref);
+    return ff_start_frame(inlink->dst->outputs[0], outpicref);
 }
 
 static av_cold void uninit(AVFilterContext *ctx)

libavfilter/vf_showinfo.c

@@ -41,7 +41,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     return 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     ShowInfoContext *showinfo = ctx->priv;
@@ -81,7 +81,7 @@ static void end_frame(AVFilterLink *inlink)
     av_log(ctx, AV_LOG_INFO, "]\n");
 
     showinfo->frame++;
-    ff_end_frame(inlink->dst->outputs[0]);
+    return ff_end_frame(inlink->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_showinfo = {

libavfilter/vf_slicify.c

@@ -59,7 +59,7 @@ static int config_props(AVFilterLink *link)
     return 0;
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     SliceContext *slice = link->dst->priv;
 
@@ -75,27 +75,34 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
     av_log(link->dst, AV_LOG_DEBUG, "h:%d\n", slice->h);
     link->cur_buf = NULL;
 
-    ff_start_frame(link->dst->outputs[0], picref);
+    return ff_start_frame(link->dst->outputs[0], picref);
 }
 
-static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     SliceContext *slice = link->dst->priv;
-    int y2;
+    int y2, ret = 0;
 
     if (slice_dir == 1) {
-        for (y2 = y; y2 + slice->h <= y + h; y2 += slice->h)
-            ff_draw_slice(link->dst->outputs[0], y2, slice->h, slice_dir);
+        for (y2 = y; y2 + slice->h <= y + h; y2 += slice->h) {
+            ret = ff_draw_slice(link->dst->outputs[0], y2, slice->h, slice_dir);
+            if (ret < 0)
+                return ret;
+        }
 
         if (y2 < y + h)
-            ff_draw_slice(link->dst->outputs[0], y2, y + h - y2, slice_dir);
+            return ff_draw_slice(link->dst->outputs[0], y2, y + h - y2, slice_dir);
     } else if (slice_dir == -1) {
-        for (y2 = y + h; y2 - slice->h >= y; y2 -= slice->h)
-            ff_draw_slice(link->dst->outputs[0], y2 - slice->h, slice->h, slice_dir);
+        for (y2 = y + h; y2 - slice->h >= y; y2 -= slice->h) {
+            ret = ff_draw_slice(link->dst->outputs[0], y2 - slice->h, slice->h, slice_dir);
+            if (ret < 0)
+                return ret;
+        }
 
         if (y2 > y)
-            ff_draw_slice(link->dst->outputs[0], y, y2 - y, slice_dir);
+            return ff_draw_slice(link->dst->outputs[0], y, y2 - y, slice_dir);
     }
+    return 0;
 }
 
 AVFilter avfilter_vf_slicify = {

libavfilter/vf_super2xsai.c

@@ -302,9 +302,9 @@ static int config_output(AVFilterLink *outlink)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { return 0; }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterLink *outlink = inlink->dst->outputs[0];
     AVFilterBufferRef  *inpicref =  inlink->cur_buf;
@@ -315,7 +315,7 @@ static void end_frame(AVFilterLink *inlink)
                inlink->w, inlink->h);
 
     ff_draw_slice(outlink, 0, outlink->h, 1);
-    ff_end_frame(outlink);
+    return ff_end_frame(outlink);
 }
 
 AVFilter avfilter_vf_super2xsai = {

libavfilter/vf_swapuv.c

@@ -46,7 +46,7 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms,
     return picref;
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
 {
     AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
 
@@ -56,7 +56,7 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
     outpicref->linesize[1] = inpicref->linesize[2];
     outpicref->linesize[2] = inpicref->linesize[1];
 
-    ff_start_frame(link->dst->outputs[0], outpicref);
+    return ff_start_frame(link->dst->outputs[0], outpicref);
 }
 
 static int query_formats(AVFilterContext *ctx)

libavfilter/vf_thumbnail.c

@@ -68,7 +68,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     return 0;
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     int i, j;
     AVFilterContext *ctx = inlink->dst;
@@ -86,6 +86,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
         }
         p += picref->linesize[0];
     }
+    return 0;
 }
 
 /**
@@ -106,7 +107,7 @@ static double frame_sum_square_err(const int *hist, const double *median)
     return sum_sq_err;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int  end_frame(AVFilterLink *inlink)
 {
     int i, j, best_frame_idx = 0;
     double avg_hist[HIST_SIZE] = {0}, sq_err, min_sq_err = -1;
@@ -122,7 +123,7 @@ static void end_frame(AVFilterLink *inlink)
     // no selection until the buffer of N frames is filled up
     if (thumb->n < thumb->n_frames - 1) {
         thumb->n++;
-        return;
+        return 0;
     }
 
     // average histogram of the N frames
@@ -156,7 +157,7 @@ static void end_frame(AVFilterLink *inlink)
     ff_start_frame(outlink, picref);
     thumb->frames[best_frame_idx].buf = NULL;
     ff_draw_slice(outlink, 0, inlink->h, 1);
-    ff_end_frame(outlink);
+    return ff_end_frame(outlink);
 }
 
 static av_cold void uninit(AVFilterContext *ctx)
@@ -170,7 +171,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     av_freep(&thumb->frames);
 }
 
-static void null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref) { }
+static int null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref) { return 0; }
 
 static int request_frame(AVFilterLink *link)
 {

libavfilter/vf_tile.c

@@ -96,23 +96,23 @@ static int config_props(AVFilterLink *outlink)
  * buffers are fed to start_frame in the order they were obtained from
  * get_buffer (think B-frames). */
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     AVFilterContext *ctx  = inlink->dst;
     TileContext *tile    = ctx->priv;
     AVFilterLink *outlink = ctx->outputs[0];
 
     if (tile->current)
-        return;
+        return 0;
     outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
                                                  outlink->w, outlink->h);
     avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
     outlink->out_buf->video->w = outlink->w;
     outlink->out_buf->video->h = outlink->h;
-    ff_start_frame(outlink, outlink->out_buf);
+    return ff_start_frame(outlink, outlink->out_buf);
 }
 
-static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx  = inlink->dst;
     TileContext *tile    = ctx->priv;
@@ -126,6 +126,7 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
                        x0, y0 + y, 0, y, inlink->cur_buf->video->w, h);
     /* TODO if tile->w == 1 && slice_dir is always 1, we could draw_slice
      * immediately. */
+    return 0;
 }
 
 static void draw_blank_frame(AVFilterContext *ctx)
@@ -153,14 +154,15 @@ static void end_last_frame(AVFilterContext *ctx)
     tile->current = 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx  = inlink->dst;
     TileContext *tile    = ctx->priv;
 
-    avfilter_unref_buffer(inlink->cur_buf);
+    avfilter_unref_bufferp(&inlink->cur_buf);
     if (++tile->current == tile->w * tile->h)
         end_last_frame(ctx);
+    return 0;
 }
 
 static int request_frame(AVFilterLink *outlink)

libavfilter/vf_tinterlace.c

@@ -198,7 +198,7 @@ void copy_picture_field(uint8_t *dst[4], int dst_linesize[4],
     }
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     AVFilterContext *ctx = inlink->dst;
     TInterlaceContext *tinterlace = ctx->priv;
@@ -206,9 +206,10 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
     avfilter_unref_buffer(tinterlace->cur);
     tinterlace->cur  = tinterlace->next;
     tinterlace->next = picref;
+    return 0;
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
@@ -220,7 +221,7 @@ static void end_frame(AVFilterLink *inlink)
 
     /* we need at least two frames */
     if (!tinterlace->cur)
-        return;
+        return 0;
 
     switch (tinterlace->mode) {
     case MODE_MERGE: /* move the odd frame into the upper field of the new image, even into
@@ -324,6 +325,8 @@ static void end_frame(AVFilterLink *inlink)
     ff_end_frame(outlink);
 
     tinterlace->frame++;
+
+    return 0;
 }
 
 static int poll_frame(AVFilterLink *outlink)
@@ -359,7 +362,7 @@ static int request_frame(AVFilterLink *outlink)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
 
 AVFilter avfilter_vf_tinterlace = {
     .name          = "tinterlace",

libavfilter/vf_transpose.c

@@ -114,12 +114,16 @@ static int config_props_output(AVFilterLink *outlink)
     return 0;
 }
 
-static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     AVFilterLink *outlink = inlink->dst->outputs[0];
+    AVFilterBufferRef *buf_out;
 
     outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
                                            outlink->w, outlink->h);
+    if (!outlink->out_buf)
+        return AVERROR(ENOMEM);
+
     outlink->out_buf->pts = picref->pts;
 
     if (picref->video->sample_aspect_ratio.num == 0) {
@@ -129,16 +133,19 @@ static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
         outlink->out_buf->video->sample_aspect_ratio.den = picref->video->sample_aspect_ratio.num;
     }
 
-    ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+    buf_out = avfilter_ref_buffer(outlink->out_buf, ~0);
+    if (!buf_out)
+        return AVERROR(ENOMEM);
+    return ff_start_frame(outlink, buf_out);
 }
 
-static void end_frame(AVFilterLink *inlink)
+static int end_frame(AVFilterLink *inlink)
 {
     TransContext *trans = inlink->dst->priv;
     AVFilterBufferRef *inpic  = inlink->cur_buf;
     AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
     AVFilterLink *outlink = inlink->dst->outputs[0];
-    int plane;
+    int plane, ret;
 
     for (plane = 0; outpic->data[plane]; plane++) {
         int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
@@ -189,11 +196,13 @@ static void end_frame(AVFilterLink *inlink)
         }
     }
 
-    ff_draw_slice(outlink, 0, outpic->video->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_draw_slice(outlink, 0, outpic->video->h, 1)) < 0 ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
+    return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
 
 AVFilter avfilter_vf_transpose = {
     .name      = "transpose",

libavfilter/vf_unsharp.c

@@ -213,24 +213,28 @@ static av_cold void uninit(AVFilterContext *ctx)
     free_filter_param(&unsharp->chroma);
 }
 
-static void end_frame(AVFilterLink *link)
+static int end_frame(AVFilterLink *link)
 {
     UnsharpContext *unsharp = link->dst->priv;
     AVFilterBufferRef *in  = link->cur_buf;
     AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
     int cw = SHIFTUP(link->w, unsharp->hsub);
     int ch = SHIFTUP(link->h, unsharp->vsub);
+    int ret;
 
     apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma);
     apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw,      ch,      &unsharp->chroma);
     apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw,      ch,      &unsharp->chroma);
 
-    ff_draw_slice(link->dst->outputs[0], 0, link->h, 1);
-    ff_end_frame(link->dst->outputs[0]);
+    if ((ret = ff_draw_slice(link->dst->outputs[0], 0, link->h, 1)) < 0 ||
+        (ret = ff_end_frame(link->dst->outputs[0])) < 0)
+        return ret;
+    return 0;
 }
 
-static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
+    return 0;
 }
 
 AVFilter avfilter_vf_unsharp = {

libavfilter/vf_vflip.c

@@ -52,6 +52,9 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms,
         return ff_default_get_video_buffer(link, perms, w, h);
 
     picref = ff_get_video_buffer(link->dst->outputs[0], perms, w, h);
+    if (!picref)
+        return NULL;
+
     for (i = 0; i < 4; i ++) {
         int vsub = i == 1 || i == 2 ? flip->vsub : 0;
 
@@ -64,12 +67,15 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms,
     return picref;
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
 {
     FlipContext *flip = link->dst->priv;
     AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
     int i;
 
+    if (!outpicref)
+        return AVERROR(ENOMEM);
+
     for (i = 0; i < 4; i ++) {
         int vsub = i == 1 || i == 2 ? flip->vsub : 0;
 
@@ -79,14 +85,14 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
         }
     }
 
-    ff_start_frame(link->dst->outputs[0], outpicref);
+    return ff_start_frame(link->dst->outputs[0], outpicref);
 }
 
-static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     AVFilterContext *ctx = link->dst;
 
-    ff_draw_slice(ctx->outputs[0], link->h - (y+h), h, -1 * slice_dir);
+    return ff_draw_slice(ctx->outputs[0], link->h - (y+h), h, -1 * slice_dir);
 }
 
 AVFilter avfilter_vf_vflip = {

libavfilter/vf_yadif.c

@@ -156,11 +156,11 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, int w,
     return picref;
 }
 
-static void return_frame(AVFilterContext *ctx, int is_second)
+static int return_frame(AVFilterContext *ctx, int is_second)
 {
     YADIFContext *yadif = ctx->priv;
     AVFilterLink *link= ctx->outputs[0];
-    int tff;
+    int tff, ret;
 
     if (yadif->parity == -1) {
         tff = yadif->cur->video->interlaced ?
@@ -172,6 +172,9 @@ static void return_frame(AVFilterContext *ctx, int is_second)
     if (is_second) {
         yadif->out = ff_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
                                          AV_PERM_REUSE, link->w, link->h);
+        if (!yadif->out)
+            return AVERROR(ENOMEM);
+
         avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
         yadif->out->video->interlaced = 0;
     }
@@ -192,15 +195,19 @@ static void return_frame(AVFilterContext *ctx, int is_second)
         } else {
             yadif->out->pts = AV_NOPTS_VALUE;
         }
-        ff_start_frame(ctx->outputs[0], yadif->out);
+        ret = ff_start_frame(ctx->outputs[0], yadif->out);
+        if (ret < 0)
+            return ret;
     }
-    ff_draw_slice(ctx->outputs[0], 0, link->h, 1);
-    ff_end_frame(ctx->outputs[0]);
+    if ((ret = ff_draw_slice(ctx->outputs[0], 0, link->h, 1)) < 0 ||
+        (ret = ff_end_frame(ctx->outputs[0])) < 0)
+        return ret;
 
     yadif->frame_pending = (yadif->mode&1) && !is_second;
+    return 0;
 }
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     AVFilterContext *ctx = link->dst;
     YADIFContext *yadif = ctx->priv;
@@ -217,46 +224,52 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
     yadif->next = picref;
 
     if (!yadif->cur)
-        return;
+        return 0;
 
     if (yadif->auto_enable && !yadif->cur->video->interlaced) {
         yadif->out  = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
-        avfilter_unref_buffer(yadif->prev);
-        yadif->prev = NULL;
+        if (!yadif->out)
+            return AVERROR(ENOMEM);
+
+        avfilter_unref_bufferp(&yadif->prev);
         if (yadif->out->pts != AV_NOPTS_VALUE)
             yadif->out->pts *= 2;
-        ff_start_frame(ctx->outputs[0], yadif->out);
-        return;
+        return ff_start_frame(ctx->outputs[0], yadif->out);
     }
 
-    if (!yadif->prev)
-        yadif->prev = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
+    if (!yadif->prev &&
+        !(yadif->prev = avfilter_ref_buffer(yadif->cur, AV_PERM_READ)))
+        return AVERROR(ENOMEM);
 
     yadif->out = ff_get_video_buffer(ctx->outputs[0], AV_PERM_WRITE | AV_PERM_PRESERVE |
                                      AV_PERM_REUSE, link->w, link->h);
+    if (!yadif->out)
+        return AVERROR(ENOMEM);
 
     avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
     yadif->out->video->interlaced = 0;
     if (yadif->out->pts != AV_NOPTS_VALUE)
         yadif->out->pts *= 2;
-    ff_start_frame(ctx->outputs[0], yadif->out);
+    return ff_start_frame(ctx->outputs[0], yadif->out);
 }
 
-static void end_frame(AVFilterLink *link)
+static int end_frame(AVFilterLink *link)
 {
     AVFilterContext *ctx = link->dst;
     YADIFContext *yadif = ctx->priv;
 
     if (!yadif->out)
-        return;
+        return 0;
 
     if (yadif->auto_enable && !yadif->cur->video->interlaced) {
-        ff_draw_slice(ctx->outputs[0], 0, link->h, 1);
-        ff_end_frame(ctx->outputs[0]);
-        return;
+        int ret = ff_draw_slice(ctx->outputs[0], 0, link->h, 1);
+        if (ret >= 0)
+            ret = ff_end_frame(ctx->outputs[0]);
+        return ret;
     }
 
     return_frame(ctx, 0);
+    return 0;
 }
 
 static int request_frame(AVFilterLink *link)
@@ -279,6 +292,9 @@ static int request_frame(AVFilterLink *link)
 
         if (ret == AVERROR_EOF && yadif->cur) {
             AVFilterBufferRef *next = avfilter_ref_buffer(yadif->next, AV_PERM_READ);
+            if (!next)
+                return AVERROR(ENOMEM);
+
             next->pts = yadif->next->pts * 2 - yadif->cur->pts;
 
             start_frame(link->src->inputs[0], next);
@@ -323,9 +339,9 @@ static av_cold void uninit(AVFilterContext *ctx)
 {
     YADIFContext *yadif = ctx->priv;
 
-    if (yadif->prev) avfilter_unref_buffer(yadif->prev);
-    if (yadif->cur ) avfilter_unref_buffer(yadif->cur );
-    if (yadif->next) avfilter_unref_buffer(yadif->next);
+    if (yadif->prev) avfilter_unref_bufferp(&yadif->prev);
+    if (yadif->cur ) avfilter_unref_bufferp(&yadif->cur );
+    if (yadif->next) avfilter_unref_bufferp(&yadif->next);
 }
 
 static int query_formats(AVFilterContext *ctx)
@@ -381,7 +397,10 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     return 0;
 }
 
-static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    return 0;
+}
 
 static int config_props(AVFilterLink *link)
 {

libavfilter/video.c

@@ -149,13 +149,15 @@ AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms, int w, int
     return ret;
 }
 
-void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     AVFilterBufferRef *buf_out = avfilter_ref_buffer(picref, ~0);
-    ff_start_frame(link->dst->outputs[0], buf_out);
+    if (!buf_out)
+        return AVERROR(ENOMEM);
+    return ff_start_frame(link->dst->outputs[0], buf_out);
 }
 
-static void default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     AVFilterLink *outlink = NULL;
 
@@ -163,21 +165,37 @@ static void default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
         outlink = inlink->dst->outputs[0];
 
     if (outlink) {
+        AVFilterBufferRef *buf_out;
         outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+        if (!outlink->out_buf)
+            return AVERROR(ENOMEM);
+
         avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
         outlink->out_buf->video->w = outlink->w;
         outlink->out_buf->video->h = outlink->h;
-        ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+        buf_out = avfilter_ref_buffer(outlink->out_buf, ~0);
+        if (!buf_out)
+            return AVERROR(ENOMEM);
+
+        return ff_start_frame(outlink, buf_out);
     }
+    return 0;
+}
+
+static void clear_link(AVFilterLink *link)
+{
+    avfilter_unref_bufferp(&link->cur_buf);
+    avfilter_unref_bufferp(&link->src_buf);
+    avfilter_unref_bufferp(&link->out_buf);
 }
 
 /* XXX: should we do the duplicating of the picture ref here, instead of
  * forcing the source filter to do it? */
-void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
-    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
+    int (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
     AVFilterPad *dst = link->dstpad;
-    int perms = picref->perms;
+    int ret, perms = picref->perms;
     AVFilterCommand *cmd= link->dst->command_queue;
     int64_t pts;
 
@@ -196,6 +214,11 @@ void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
                 link->dstpad->min_perms, link->dstpad->rej_perms);
 
         link->cur_buf = ff_get_video_buffer(link, dst->min_perms, link->w, link->h);
+        if (!link->cur_buf) {
+            avfilter_unref_bufferp(&picref);
+            return AVERROR(ENOMEM);
+        }
+
         link->src_buf = picref;
         avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
 
@@ -215,22 +238,26 @@ void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
         cmd= link->dst->command_queue;
     }
     pts = link->cur_buf->pts;
-    start_frame(link, link->cur_buf);
+    ret = start_frame(link, link->cur_buf);
     ff_update_link_current_pts(link,link->cur_buf ?  link->cur_buf->pts : pts);
+    if (ret < 0)
+        clear_link(link);
+
+    return ret;
 }
 
-void ff_null_start_frame_keep_ref(AVFilterLink *inlink,
+int ff_null_start_frame_keep_ref(AVFilterLink *inlink,
                                                 AVFilterBufferRef *picref)
 {
-    ff_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
+    return ff_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
 }
 
-void ff_null_end_frame(AVFilterLink *link)
+int ff_null_end_frame(AVFilterLink *link)
 {
-    ff_end_frame(link->dst->outputs[0]);
+    return ff_end_frame(link->dst->outputs[0]);
 }
 
-static void default_end_frame(AVFilterLink *inlink)
+static int default_end_frame(AVFilterLink *inlink)
 {
     AVFilterLink *outlink = NULL;
 
@@ -238,37 +265,32 @@ static void default_end_frame(AVFilterLink *inlink)
         outlink = inlink->dst->outputs[0];
 
     if (outlink) {
-        ff_end_frame(outlink);
+        return ff_end_frame(outlink);
     }
+    return 0;
 }
 
-void ff_end_frame(AVFilterLink *link)
+int ff_end_frame(AVFilterLink *link)
 {
-    void (*end_frame)(AVFilterLink *);
+    int (*end_frame)(AVFilterLink *);
+    int ret;
 
     if (!(end_frame = link->dstpad->end_frame))
         end_frame = default_end_frame;
 
-    end_frame(link);
+    ret = end_frame(link);
 
-    /* unreference the source picture if we're feeding the destination filter
-     * a copied version dues to permission issues */
-    if (link->src_buf) {
-        avfilter_unref_buffer(link->src_buf);
-        link->src_buf = NULL;
-    }
-    if(link->cur_buf != link->out_buf)
-        avfilter_unref_bufferp(&link->cur_buf);
-    link->cur_buf = NULL;
-    avfilter_unref_bufferp(&link->out_buf);
+    clear_link(link);
+
+    return ret;
 }
 
-void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+int ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
-    ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+    return ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
 }
 
-static void default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterLink *outlink = NULL;
 
@@ -276,14 +298,15 @@ static void default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir
         outlink = inlink->dst->outputs[0];
 
     if (outlink)
-        ff_draw_slice(outlink, y, h, slice_dir);
+        return ff_draw_slice(outlink, y, h, slice_dir);
+    return 0;
 }
 
-void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     uint8_t *src[4], *dst[4];
-    int i, j, vsub;
-    void (*draw_slice)(AVFilterLink *, int, int, int);
+    int i, j, vsub, ret;
+    int (*draw_slice)(AVFilterLink *, int, int, int);
 
     FF_TPRINTF_START(NULL, draw_slice); ff_tlog_link(NULL, link, 0); ff_tlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
 
@@ -317,11 +340,14 @@ void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 
     if (!(draw_slice = link->dstpad->draw_slice))
         draw_slice = default_draw_slice;
-    draw_slice(link, y, h, slice_dir);
+    ret = draw_slice(link, y, h, slice_dir);
+    if (ret < 0)
+        clear_link(link);
+    return ret;
 }
 
-void avfilter_default_end_frame(AVFilterLink *inlink)
+int avfilter_default_end_frame(AVFilterLink *inlink)
 {
-    default_end_frame(inlink);
+    return default_end_frame(inlink);
 }
 

libavfilter/video.h

@@ -42,9 +42,9 @@ AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w
 AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms,
                                        int w, int h);
 
-void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
-void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
-void ff_null_end_frame(AVFilterLink *link);
+int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
+int ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
+int ff_null_end_frame(AVFilterLink *link);
 
 /**
  * Notify the next filter of the start of a frame.
@@ -54,20 +54,25 @@ void ff_null_end_frame(AVFilterLink *link);
  *               frame need only be valid once draw_slice() is called for that
  *               portion. The receiving filter will free this reference when
  *               it no longer needs it.
+ *
+ * @return >= 0 on success, a negative AVERROR on error. This function will
+ * unreference picref in case of error.
  */
-void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
+int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
 
 /**
  * Pass video frame along and keep an internal reference for later use.
  */
-void ff_null_start_frame_keep_ref(AVFilterLink *inlink, AVFilterBufferRef *picref);
+int ff_null_start_frame_keep_ref(AVFilterLink *inlink, AVFilterBufferRef *picref);
 
 /**
  * Notify the next filter that the current frame has finished.
  *
  * @param link the output link the frame was sent over
+ *
+ * @return >= 0 on success, a negative AVERROR on error
  */
-void ff_end_frame(AVFilterLink *link);
+int ff_end_frame(AVFilterLink *link);
 
 /**
  * Send a slice to the next filter.
@@ -83,7 +88,9 @@ void ff_end_frame(AVFilterLink *link);
  *             from the top slice to the bottom slice if the value is 1,
  *             from the bottom slice to the top slice if the value is -1,
  *             for other values the behavior of the function is undefined.
+ *
+ * @return >= 0 on success, a negative AVERROR on error.
  */
-void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
+int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
 
 #endif /* AVFILTER_VIDEO_H */

libavfilter/vsink_nullsink.c

@@ -19,12 +19,14 @@
 #include "avfilter.h"
 #include "internal.h"
 
-static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
+    return 0;
 }
 
-static void end_frame(AVFilterLink *link)
+static int end_frame(AVFilterLink *link)
 {
+    return 0;
 }
 
 AVFilter avfilter_vsink_nullsink = {

libavfilter/vsrc_color.c

@@ -149,18 +149,38 @@ static int color_request_frame(AVFilterLink *link)
 {
     ColorContext *color = link->src->priv;
     AVFilterBufferRef *picref = ff_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
+    AVFilterBufferRef *buf_out;
+    int ret;
+
+    if (!picref)
+        return AVERROR(ENOMEM);
+
     picref->video->sample_aspect_ratio = (AVRational) {1, 1};
     picref->pts = color->pts++;
     picref->pos = -1;
 
-    ff_start_frame(link, avfilter_ref_buffer(picref, ~0));
+    buf_out = avfilter_ref_buffer(picref, ~0);
+    if (!buf_out) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    ret = ff_start_frame(link, buf_out);
+    if (ret < 0)
+        goto fail;
+
     ff_fill_rectangle(&color->draw, &color->color, picref->data, picref->linesize,
                       0, 0, color->w, color->h);
-    ff_draw_slice(link, 0, color->h, 1);
-    ff_end_frame(link);
+    ret = ff_draw_slice(link, 0, color->h, 1);
+    if (ret < 0)
+        goto fail;
+
+    ret = ff_end_frame(link);
+
+fail:
     avfilter_unref_buffer(picref);
 
-    return 0;
+    return ret;
 }
 
 AVFilter avfilter_vsrc_color = {

libavfilter/vsrc_testsrc.c

@@ -134,10 +134,14 @@ static int request_frame(AVFilterLink *outlink)
 {
     TestSourceContext *test = outlink->src->priv;
     AVFilterBufferRef *picref;
+    int ret;
 
     if (test->max_pts >= 0 && test->pts >= test->max_pts)
         return AVERROR_EOF;
     picref = ff_get_video_buffer(outlink, AV_PERM_WRITE, test->w, test->h);
+    if (!picref)
+        return AVERROR(ENOMEM);
+
     picref->pts = test->pts++;
     picref->pos = -1;
     picref->video->key_frame = 1;
@@ -147,9 +151,10 @@ static int request_frame(AVFilterLink *outlink)
     test->fill_picture_fn(outlink->src, picref);
     test->nb_frame++;
 
-    ff_start_frame(outlink, picref);
-    ff_draw_slice(outlink, 0, test->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_start_frame(outlink, picref)) < 0 ||
+        (ret = ff_draw_slice(outlink, 0, test->h, 1)) < 0 ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
 
     return 0;
 }

libavformat/matroskadec.c

@@ -656,8 +656,9 @@ static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
             av_log(matroska->ctx, AV_LOG_ERROR,
                    "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
                    pos, pos);
+            return pb->error ? pb->error : AVERROR(EIO);
         }
-        return AVERROR(EIO); /* EOS or actual I/O error */
+        return AVERROR_EOF;
     }
 
     /* get the length of the EBML number */

tests/Makefile

@@ -54,6 +54,7 @@ include $(SRC_PATH)/tests/fate/demux.mak
 include $(SRC_PATH)/tests/fate/dfa.mak
 include $(SRC_PATH)/tests/fate/dpcm.mak
 include $(SRC_PATH)/tests/fate/ea.mak
+include $(SRC_PATH)/tests/fate/filter.mak
 include $(SRC_PATH)/tests/fate/flac.mak
 include $(SRC_PATH)/tests/fate/fft.mak
 include $(SRC_PATH)/tests/fate/h264.mak

tests/fate/filter.mak

@@ -0,0 +1,10 @@
+FATE_ASYNCTS += fate-filter-asyncts
+fate-filter-asyncts: SRC = $(SAMPLES)/nellymoser/nellymoser-discont.flv
+fate-filter-asyncts: CMD = pcm -i $(SRC) -af aresample=min_comp=0.001:min_hard_comp=0.1
+fate-filter-asyncts: CMP = oneoff
+fate-filter-asyncts: REF = $(SAMPLES)/nellymoser/nellymoser-discont.pcm
+
+FATE_FILTER += $(FATE_ASYNCTS)
+FATE_SAMPLES_AVCONV += $(FATE_ASYNCTS)
+
+fate-filter: $(FATE_FILTER)