Opus 1.1 alpha version (not BABYEATER), [split from the good old megathread] Options

[IgorC]

If somebody hasn't seen there is an official Opus 1.1 alpha.

https://ftp.mozilla.org/pub/mozilla.org/opu...alpha-win32.zip

Also some kinda settings to play with
https://wiki.xiph.org/Opus_tuning

[softrunner]

Spectrograms are basically meaningless for looking at lossy audio.

I am not substituting audio listening for looking at spectrograms. These spectrograms were posted for those who do no want to download and listen audio samples, just to allow them to realize, that Opus can give some bad result for some samples for now. Do not understand, why these pictures produced such an interest. I always use spectrograms because they give me additional information about work of encoder.

There's normally good reason to expect that feeding an encoder a basically constant signal will result in basically constant output, and finding something else might lead one to think there's a bug.
...

I do not know much about work of Opus encoder, but, definitely, if encoder cannot produce constant result, there must be some bug: eigther logical error in it's algorithm or mayby it is just some arithmetic mistake. Also I can say, that Opus 1.0.2 doesn't have these two bugs.

[db1989]

Do not understand, why these pictures produced such an interest.

Then read #8 of the Terms of Service if you haven’t already. I already explained this, too: If a perceptual encoder is doing its job, all the pictures in the world are meaningless.

I always use spectrograms because they give me additional information about work of encoder.

As above. This may be informative in edge cases, but you are liable to draw inaccurate conclusions from visual summaries of audio, for the obvious reason that you don’t listen to music with your eyes.

I already said that I was glad that your post led to some useful discussion and the potential for improvement in Opus. That doesn’t mean you should put too much faith in spectrograms et al. in all cases.