buffersrc: handle non-refcounted frames in av_buffersrc_add_frame() correctly

libavfilter/buffersrc.c

@@ -94,7 +94,7 @@ int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx,
 {
     BufferSourceContext *s = ctx->priv;
     AVFrame *copy;
-    int ret;
+    int refcounted, ret;
 
     if (!frame) {
         s->eof = 1;
@@ -102,6 +102,8 @@ int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx,
     } else if (s->eof)
         return AVERROR(EINVAL);
 
+    refcounted = !!frame->buf[0];
+
     switch (ctx->outputs[0]->type) {
     case AVMEDIA_TYPE_VIDEO:
         CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
@@ -122,10 +124,20 @@ int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx,
 
     if (!(copy = av_frame_alloc()))
         return AVERROR(ENOMEM);
-    av_frame_move_ref(copy, frame);
+
+    if (refcounted) {
+        av_frame_move_ref(copy, frame);
+    } else {
+        ret = av_frame_ref(copy, frame);
+        if (ret < 0) {
+            av_frame_free(&copy);
+            return ret;
+        }
+    }
 
     if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
-        av_frame_move_ref(frame, copy);
+        if (refcounted)
+            av_frame_move_ref(frame, copy);
         av_frame_free(&copy);
         return ret;
     }