print error when dv frame profile cannot be found

Originally committed as revision 19193 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dv.c

@@ -1120,8 +1120,10 @@ static int dvvideo_decode_frame(AVCodecContext *avctx,
     DVVideoContext *s = avctx->priv_data;
 
     s->sys = dv_frame_profile(s->sys, buf, buf_size);
-    if (!s->sys || buf_size < s->sys->frame_size || dv_init_dynamic_tables(s->sys))
+    if (!s->sys || buf_size < s->sys->frame_size || dv_init_dynamic_tables(s->sys)) {
+        av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
         return -1; /* NOTE: we only accept several full frames */
+    }
 
     if (s->picture.data[0])
         avctx->release_buffer(avctx, &s->picture);