- sample_rate = av_dbl2ext((double)enc->sample_rate);
- avio_write(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
+ sample_rate = av_double2int(enc->sample_rate);
+ avio_wb16(pb, (sample_rate >> 52) + (16383 - 1023));
+ avio_wb64(pb, UINT64_C(1) << 63 | sample_rate << 11);