memcpy(st->codecpar->extradata, streaminfo_start, st->codecpar->extradata_size);
samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
memcpy(st->codecpar->extradata, streaminfo_start, st->codecpar->extradata_size);
samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;