libavformat/flvdec.c:775: error: Uninitialized Value
  The value read from size was never initialized.

libavformat/flvdec.c:775:9: 
773.         st->codec->codec_id == AV_CODEC_ID_H264) {
774.         int type = avio_r8(s->pb);
775.         size--;
             ^
776.         if (st->codec->codec_id == AV_CODEC_ID_H264) {
777.             int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
