libavformat/flvdec.c:384: error: Uninitialized Value
  The value read from is_audio was never initialized.

libavformat/flvdec.c:384:8: 
382.     }
383. 
384.     if(is_audio){
            ^
385.         if(!st->codec->sample_rate || !st->codec->bits_per_coded_sample || (!st->codec->codec_id && !st->codec->codec_tag)) {
386.             st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
