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Opus 1.1 alpha version (not BABYEATER), [split from the good old megathread]
Martel
post Jan 1 2013, 11:46
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QUOTE (softrunner @ Dec 29 2012, 04:50) *
I don't know weather it is possible for encoder to do such an analysis of a source audio, but it would be great it yes.
It's only a matter of finding the right formula/algorithm.
There may be another reason why it's not done the way you described and that reason may be bitrate predictability. Personally, I would find it unnerving if I was encoding my collection for a portable device and would get a totally random bitrate for each song. I would have no idea how much I could fit onto the device and I could even end up in a situation where I would have to re-encode everything at a lower setting so it fits in there.


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IE4 Rockbox Clip+ AAC@192; HD 668B/HD 518 Xonar DX FB2k FLAC;
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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 14 2013, 02:33
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QUOTE (Martel @ Jan 1 2013, 14:46) *
QUOTE (softrunner @ Dec 29 2012, 04:50) *
I don't know weather it is possible for encoder to do such an analysis of a source audio, but it would be great it yes.
It's only a matter of finding the right formula/algorithm.

x264 video encoder has encoding mode called Constant Rate Factor. In this mode number (16, 17, etc) is used to define desired quality (lower - better quality and higher bitrate), and encoder does not care about bitrate, only about keeping rate factor constant. It is a question, why nobody has invented something similar for audio encoding (except lossyWAV, which needs too much bitrate for acceptable quality)?
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Opus 1.1 Alpha has some bugs, which can be found using samples from thread High Frequency Listening Test Samples. For example, at 16-24 kbps Opus gives this:

and for 32-40 kbps it gives this:

For samples 1_12kHz, 1_20kHz, 2_8kHz, 2_12kHz and 2_20kHz Opus sounds wrongly even at 512 kbps.
Full set of files is here (problematic sampes are marked with exclamation mark). Hope, developers will use this samples in their work.

This post has been edited by softrunner: Feb 14 2013, 02:34
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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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