int first = field_info >> 16;
int last = field_info & 0xffff; // last is exclusive
int bps = av_get_bits_per_sample(st->codec->codec_id)>>3;
int first = field_info >> 16;
int last = field_info & 0xffff; // last is exclusive
int bps = av_get_bits_per_sample(st->codec->codec_id)>>3;