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Opus 1.1 alpha version (not BABYEATER), [split from the good old megathread]
IgorC
post Feb 10 2013, 02:00
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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
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softrunner
post Feb 16 2013, 02:11
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QUOTE (saratoga @ Feb 14 2013, 23:16) *
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. blink.gif I always use spectrograms because they give me additional information about work of encoder.

QUOTE (jensend @ Feb 15 2013, 03:02) *
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.
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db1989
post Feb 16 2013, 03:48
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QUOTE (softrunner @ Feb 16 2013, 01:11) *
Do not understand, why these pictures produced such an interest. blink.gif
Then read #8 of the Terms of Service if you havenít already. I already explained this, too: If a perceptual encoder is doing its job, all the pictures in the world are meaningless.

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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 donít 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 doesnít mean you should put too much faith in spectrograms et al. in all cases.
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Posts in this topic
- IgorC   Opus 1.1 alpha version (not BABYEATER)   Feb 10 2013, 02:00
- - Seren   QUOTE (IgorC @ Feb 10 2013, 09:00) If som...   Feb 10 2013, 10:53
- - moosehunter   I compiled opus-tools with libopus 1.1-alpha using...   Feb 13 2013, 04:54
- - LithosZA   QUOTE I compiled opus-tools with libopus 1.1-alpha...   Feb 13 2013, 06:39
- - Jplus   Since eig is known to be a hard sample it shouldn...   Feb 13 2013, 10:05
- - Banned   And what are these graphs supposed to show? Why do...   Feb 14 2013, 07:19
|- - softrunner   QUOTE (Banned @ Feb 14 2013, 10:19) And w...   Feb 14 2013, 09:15
|- - saratoga   QUOTE (softrunner @ Feb 14 2013, 03:15) Q...   Feb 14 2013, 20:16
|- - db1989   QUOTE (saratoga @ Feb 14 2013, 19:16) QUO...   Feb 14 2013, 20:25
- - jensend   Plenty of people ready to ream the guy with knee-j...   Feb 15 2013, 00:02
|- - db1989   QUOTE (jensend @ Feb 14 2013, 23:02) Plen...   Feb 15 2013, 16:39
- - softrunner   QUOTE (saratoga @ Feb 14 2013, 23:16) Spe...   Feb 16 2013, 02:11
|- - db1989   QUOTE (softrunner @ Feb 16 2013, 01:11) D...   Feb 16 2013, 03:48
- - IgorC   After performing some blind tests on Opus 1.1a and...   Feb 23 2013, 19:12
- - CoRoNe   Although I'm no expert in detecting audible di...   Feb 23 2013, 23:06
- - CoRoNe   I didn't think my post would fit in either of ...   Feb 23 2013, 23:51
- - IgorC   A single result for sample http://www.rarewares.or...   Mar 14 2013, 03:14
|- - jmvalin   QUOTE (IgorC @ Mar 13 2013, 22:14) A sing...   Mar 14 2013, 21:41
- - mzso   Is it normal to get weird gap/crackly artifacts at...   Mar 14 2013, 20:32
|- - IgorC   QUOTE (mzso @ Mar 14 2013, 16:32) Is it n...   Mar 15 2013, 03:59
|- - mzso   QUOTE (IgorC @ Mar 15 2013, 04:59) QUOTE ...   Mar 15 2013, 09:45
- - IgorC   The noise is constant during the whole tonal part ...   Mar 15 2013, 03:37
|- - jmvalin   QUOTE (IgorC @ Mar 14 2013, 22:37) The no...   Mar 16 2013, 00:37
- - IgorC   OK. And yes, You're right. This isn't a ...   Mar 16 2013, 02:28
|- - jmvalin   QUOTE (IgorC @ Mar 15 2013, 21:28) Also t...   Mar 16 2013, 02:50
- - IgorC   It behaves exactly the same. Both beginnings have ...   Mar 16 2013, 03:05
|- - jmvalin   QUOTE (IgorC @ Mar 15 2013, 22:05) It beh...   Mar 16 2013, 03:35
- - IgorC   No hurry at all. If it will be improved at some po...   Mar 16 2013, 03:56
- - darkbyte   I wonder if there's any new builds we can try....   Apr 1 2013, 18:10
|- - lithoc   QUOTE (darkbyte @ Apr 2 2013, 01:10) I wo...   Apr 2 2013, 06:33
- - eahm   Every codec knows how to trick our earing, don...   Apr 2 2013, 06:42
- - wswartzendruber   I'm sitting here telling myself that Google Mu...   Apr 6 2013, 03:46
- - Mach-X   Coffee. Oh and as long as Starbucks coffee exists,...   Apr 6 2013, 04:20
- - softrunner   As I wrote before, Opus 1.1 alpha has some bugs, t...   Apr 7 2013, 23:11
|- - saratoga   QUOTE (softrunner @ Apr 7 2013, 17:11) Wh...   Apr 7 2013, 23:15
|- - jmvalin   QUOTE (softrunner @ Apr 7 2013, 18:11) Fo...   Apr 8 2013, 03:01
- - softrunner   QUOTE (saratoga @ Apr 8 2013, 02:15) Sure...   Apr 7 2013, 23:19
|- - saratoga   QUOTE (softrunner @ Apr 7 2013, 17:19) QU...   Apr 8 2013, 00:35
- - Gainless   Ok, so here's another ABXable issue with tonal...   Apr 8 2013, 20:36
- - Gainless   I've played a bit around with different frames...   May 6 2013, 17:13


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