It's quite possible to come up with a graph that tries to be more exact rather than heuristic. igorc's graph from 2014 would be more of a starting point for such an endeavor. It'd need to be updated for Opus 1.2, and it would benefit from more listening test evidence.
Because some codecs' performance depends so much on the difference, one really would need at least two separate graphs - one for fullband stereo music and one for speech.
I've been using Opus 1.2.1 @~64 on iOS foobar2000.
* Version 3.4.0
- Fixed display of '&' symbol in playlist.
- Fixed admin rights detection in install scripts when Server service is disabled.
- Fixed crush when album art size is set to 0.
- Changed volume control handling to better match with foobar2000 volume control behaviour.
- Fixed memory leak in album art handler.
The UMX reader is for UT99.ooh ok yeah I don't have that installed...
It's interesting to observe that 4 members have mentioned Opus@80kbps as point where is hard to spot artifacts for them.
Opus ~80 kbps is roughly equivalent to LAME ~130 kbps (V5) which lands in an "excellent" area of quality (MOS 4.5+) http://listening-tests.hydrogenaud.io/sebastian/mp3-128-1/results.htm
So one could say that Opus 80 kbps is "excellent" at least for an average listener. It's clear that an experienced listeners can spot artifacts at much higher rates.
I never noticed any artifacts at 80kbps though, though I haven't tried to find any either.
I tried it and for me it's 80 kbit.
I'll be honest, I struggled to ABX at 64kbps. 80kbps is enough for me.
80kbps is pretty much my limit as well, can't be bothered listening to killer samples all the time.
Last post by kode54 -
I was only suggesting it in case of the weird possibility of a Phillips ADC that encodes HDCD information, however rare that may be.
God damn Opus is an amazing codec, I hope it continues to improve - although I have no idea how much further it can be pushed. I remember thinking transparency at 128kbps would be an amazing achievement.isn't it just :-)
I think the biggest thing right now is getting it supported in software and hardware so it can be used more widely. It seems to be the way forward.