diff --git a/libavformat/dvenc.c b/libavformat/dvenc.c
index e99ac3ce7e..502cc26a06 100644
--- a/libavformat/dvenc.c
+++ b/libavformat/dvenc.c
@@ -250,6 +250,11 @@ static int dv_assemble_frame(DVMuxContext *c, AVStream* st,
         /* FIXME: we have to have more sensible approach than this one */
         if (c->has_video)
             av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
+        if (data_size != c->sys->frame_size) {
+            av_log(st->codec, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
+                   data_size, c->sys->frame_size);
+            return AVERROR(ENOSYS);
+        }
 
         memcpy(*frame, data, c->sys->frame_size);
         c->has_video = 1;