libavformat/flvdec.c:904: error: Uninitialized Value
  The value read from size was never initialized.

libavformat/flvdec.c:904:9: 
902.         st->codecpar->codec_id == AV_CODEC_ID_H264) {
903.         int type = avio_r8(s->pb);
904.         size--;
             ^
905.         if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
906.             // sign extension
