4 ms·

I just compared 730 kb/s Flac with 160kb/s Opus, I can see no difference even on spectrogram using 'mother of mp3' track: Tom's Diner (Live At The Royal Albert

I just compared 730 kb/s Flac with 160kb/s Opus, I can see no difference even on spectrogram using 'mother of mp3' track: Tom's Diner (Live At The Royal Albert Hall, London, UK, November 18, 1986). Very surprising, will be migrating all my music to opus to save space.

rokweom 5y ago
Just as a side note, spectrogram are not in any way indicative of compression quality. Its interesting that you didn't see any differences between flac and opus, as opus has a hard 20 kHz low-pass filter and is 48kHz-only.
- diimdeep 5y ago
  There is visible 20 kHz LPF, but it is meaningless for use case of music listening, right ? I did not liked degradation at 140-128kb/s and noise above 16kHz and some artifacts 10-16khz that is clearly visible and much more impactful. Here is spectrograms https://disk.yandex.com/d/PvQGSS2xBu7ucQ https://disk.yandex.com/d/PvQGSS2xBu7ucQ
  - rokweom 5y ago
    As I said, spectrograms are not indicative of compression quality. Codecs should be judged by ears only. What you see in a spectrogram will vastly differ between codecs and will not reflect their compression efficiency.
jacquesm 5y ago
Beware of phase differences, they won't show up on a spectrogram but could seriously upset your stereo impression. Before you compress all your Flac content and only figure this one out afterwards. That could be quite annoying.
- Groxx 5y ago
  Yeah - definitely keep your backups in FLAC. Having a lossless source gives you infinite future flexibility, and that cannot be underestimated. Otherwise you're kinda doomed to hit https://www.youtube.com/watch?v=fZCRYo-0K0c https://www.youtube.com/watch?v=fZCRYo-0K0c eventually. For on-listening-device though, oh heck yes - Opus is great.
Nasreddin_Hodja 5y ago
> I just compared 730 kb/s Flac with 160kb/s Opus, I can see no difference even on spectrogram Doesn't Ogg Vorbis perform better than Opus on bitrates above 128kbps?
- NavinF 5y ago
  Opus is transparent at 160kb/s, so no.
  - Nasreddin_Hodja 5y ago
    When comparing, your vorbis examples were encoded with 48kHz too?

rokweom 5y ago

Just as a side note, spectrogram are not in any way indicative of compression quality. Its interesting that you didn't see any differences between flac and opus, as opus has a hard 20 kHz low-pass filter and is 48kHz-only.

diimdeep 5y ago
There is visible 20 kHz LPF, but it is meaningless for use case of music listening, right ? I did not liked degradation at 140-128kb/s and noise above 16kHz and some artifacts 10-16khz that is clearly visible and much more impactful. Here is spectrograms https://disk.yandex.com/d/PvQGSS2xBu7ucQ https://disk.yandex.com/d/PvQGSS2xBu7ucQ
- rokweom 5y ago
  As I said, spectrograms are not indicative of compression quality. Codecs should be judged by ears only. What you see in a spectrogram will vastly differ between codecs and will not reflect their compression efficiency.

jacquesm 5y ago

Beware of phase differences, they won't show up on a spectrogram but could seriously upset your stereo impression. Before you compress all your Flac content and only figure this one out afterwards. That could be quite annoying.

Groxx 5y ago
Yeah - definitely keep your backups in FLAC. Having a lossless source gives you infinite future flexibility, and that cannot be underestimated. Otherwise you're kinda doomed to hit https://www.youtube.com/watch?v=fZCRYo-0K0c https://www.youtube.com/watch?v=fZCRYo-0K0c eventually. For on-listening-device though, oh heck yes - Opus is great.

Nasreddin_Hodja 5y ago

> I just compared 730 kb/s Flac with 160kb/s Opus, I can see no difference even on spectrogram Doesn't Ogg Vorbis perform better than Opus on bitrates above 128kbps?

NavinF 5y ago
Opus is transparent at 160kb/s, so no.
- Nasreddin_Hodja 5y ago
  When comparing, your vorbis examples were encoded with 48kHz too?