diff --git a/transcoder/transcode/transcode_session.c b/transcoder/transcode/transcode_session.c
index 33aa6822..31a572c5 100644
--- a/transcoder/transcode/transcode_session.c
+++ b/transcoder/transcode/transcode_session.c
@@ -124,6 +124,7 @@ int transcode_session_set_media_info(transcode_session_t *ctx,transcode_mediaInf
                 newCodecParams->extradata!=NULL &&
                 currentCodecParams->extradata!=NULL
                 // FIXME: uncomment memcp!!!
+                && ctx->processedStats.totalFrames > 0
                 /*&& 0!=memcmp(newCodecParams->extradata,currentCodecParams->extradata,currentCodecParams->extradata_size)*/)
                 changed=true;
         }