libavformat/flvdec.c:917: error: Uninitialized Value
  The value read from is_audio was never initialized.

libavformat/flvdec.c:917:28: 
915.         if (type == 0) {
916.             if (st->codecpar->extradata) {
917.                 if ((ret = flv_queue_extradata(flv, s->pb, is_audio, size)) < 0)
                                ^
918.                     return ret;
919.                 ret = AVERROR(EAGAIN);
