libavformat/flvdec.c:352: error: Uninitialized Value
  The value read from is_audio was never initialized.

libavformat/flvdec.c:352:8: 
350.     }
351. 
352.     if(is_audio){
            ^
353.         if(!st->codec->sample_rate || !st->codec->bits_per_sample || (!st->codec->codec_id && !st->codec->codec_tag)) {
354.             st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
