libavformat/flvdec.c:843: error: Uninitialized Value
  The value read from size was never initialized.

libavformat/flvdec.c:843:9: 
841.         st->codec->codec_id == AV_CODEC_ID_H264) {
842.         int type = avio_r8(s->pb);
843.         size--;
             ^
844.         if (st->codec->codec_id == AV_CODEC_ID_H264) {
845.             // sign extension
