libavformat/flvenc.c:518: error: Uninitialized Value
  The value read from flags was never initialized.

libavformat/flvenc.c:518:9: 
516.         avio_wb32(pb, data_size + 11);
517.     } else {
518.         avio_w8(pb,flags);
             ^
519.         if (enc->codec_id == AV_CODEC_ID_VP6)
520.             avio_w8(pb, 0);
