diff --git a/libavcodec/tdsc.c b/libavcodec/tdsc.c
index d1265a006d..8460568d7d 100644
--- a/libavcodec/tdsc.c
+++ b/libavcodec/tdsc.c
@@ -609,7 +609,7 @@ static int tdsc_decode_frame(AVCodecContext *avctx, void *data,
     }
     *got_frame = 1;
 
-    return 0;
+    return avpkt->size;
 }
 
 AVCodec ff_tdsc_decoder = {