FLV_AUDIO_SAMPLESSIZE_OFFSET   28 libavformat/flv.h #define FLV_AUDIO_SAMPLESSIZE_OFFSET 1
FLV_AUDIO_SAMPLESSIZE_OFFSET   63 libavformat/flv.h FLV_SAMPLESSIZE_16BIT = 1 << FLV_AUDIO_SAMPLESSIZE_OFFSET,