Thanks for upload but I found Opus doesn't best result, I Found article Opus designed for live streaming not for best quality Please read this = https://resoundsound.com/sample-rate-bit-depth/ (I know Opus from this) https://people.xiph.org/~xiphmont/demo/neil-young.html Based comparision https://en.wikipedia.org/wiki/Comparison_of_audio_coding_formats so assume the best result Is 1. Masterfile Uncompressed idk wich format depends studio record 2. Lossles Flac (50% or 60% Compression without changing bitrare, Sample rate or anything) 3. Lossles ALAC from Apple 4. Ogg 5. Opus Conclution Flac compretion rate 50%-65% is best result for mastering (save data to hardrive or converting to another lossy audio) , good for Big Speaker or Big Sound system In my recommendation for mobile device Ogg 500 kbps same result as Flac Ogg 400 kbps Nice Ogg 320 kbps okay Apple ALAC for Iphone (Of course can play ogg) sample rate 48000Hz for file Video sample rate 44100hz for earphone/headset also use VBR (Variable Bit rate) for best audio QBR (Expand from ABR) ABR (just expand from crap CBR alogarithm) don't use CBR (that's old crap)

@amariami Since Opus is lossy it will obviously be inferior to any lossless audio format when it comes to fidelity. But so is Ogg. So no, Ogg 500 kbps is not the same as FLAC. But at such a high bitrate Ogg is transparent to humans anyway. And Opus isn’t exclusively designed for live transmissions. It is optimised for it but also functions perfectly fine otherwise. In every single comparison I’ve seen, Opus outperformed Ogg at equal bitrates. At low enough bitrates even AAC is better than Ogg. Transparency for Opus 1.3 encoded files should be reached in the 100 to 140 kbps range though which is vastly better than any competing format. If you want lossless audio, pick FLAC or ALAC. If you want to save space, pick Opus 1.3. If your player doesn’t support Opus, pick Ogg, AAC, and finally MP3 in that order.