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New opus test build
NullC
post Apr 16 2013, 23:31
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I've posted up a new win32 build of libopus git master: https://people.xiph.org/~greg/opus-tools_exp_a8783a1.zip

There aren't many major changes from the prior alpha but a number of small bugs fix, some of which impact quality. I think we're particular interested in knowing about any quality regressions vs prior versions and particular cases where the speech/music detection get confused. (For the actual release we'll likely back that detector off at high rates but for now it's set more aggressively in order to find problems)
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IgorC
post Apr 25 2013, 21:56
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Gainless,

Some time ago You have submited one sample with low frequency content. The most of other formats had very low bitrate on it, but not Opus. There was a test patch for it. It has decreased a bitrate on this sample dramatically while there were some not harsh birdie-style (frequency modulation/sweeps) artifacts. It could be good for 64 kbps, maybe at 96 kbps too (?), but at 192 kbps when one expects (near) transparency for all samples even some tiny issue isn't acceptable.

I have a few albums where I've noticed that Opus doesn't save bitrate on parts with low frequency content.

This post has been edited by IgorC: Apr 25 2013, 21:57
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Gainless
post Apr 25 2013, 22:11
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QUOTE (IgorC @ Apr 25 2013, 22:56) *
Gainless,

Some time ago You have submited one sample with low frequency content. The most of other formats had very low bitrate on it, but not Opus. There was a test patch for it. It has decreased a bitrate on this sample dramatically while there were some not harsh birdie-style (frequency modulation/sweeps) artifacts. It could be good for 64 kbps, maybe at 96 kbps too (?), but at 192 kbps when one expects (near) transparency for all samples even some tiny issue isn't acceptable.

I have a few albums where I've noticed that Opus doesn't save bitrate on parts with low frequency content.

Like I've said in a previous post, it's mainly about stuff I can't ABX at 64 kbps. I can't remember about a sample I posted for which a certain test patch was made btw, just one with a bit of basic tonal content (Project 100), and a kick (Meduzz) from the old Opus mega-thread, where I've noticed a huge bitrate saving for other encoders. Do you mean one of these two?

This post has been edited by Gainless: Apr 25 2013, 23:04
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Posts in this topic
- NullC   New opus test build   Apr 16 2013, 23:31
- - Dynamic   I was trying to test the speech/music detection, b...   Apr 17 2013, 19:32
|- - jmvalin   QUOTE (Dynamic @ Apr 17 2013, 14:32) I wa...   Apr 17 2013, 21:13
- - Gainless   Good to see the Muse Breaks fix finally bundled. B...   Apr 17 2013, 20:32
|- - jmvalin   QUOTE (Gainless @ Apr 17 2013, 15:32) Goo...   Apr 17 2013, 21:13
|- - Gainless   QUOTE (jmvalin @ Apr 17 2013, 22:13) I th...   Apr 19 2013, 14:57
- - CoRoNe   Using this test build (libopus 1.1a-67) to encode ...   Apr 18 2013, 20:27
- - Gainless   Forgot to add this one: Probably the worst of the...   Apr 20 2013, 10:52
- - IgorC   Gainless, Can You provide some ABC/HR logs compar...   Apr 20 2013, 16:14
|- - Gainless   QUOTE (IgorC @ Apr 20 2013, 17:14) Gainle...   Apr 21 2013, 10:33
- - IgorC   Here are some results for 96 kbps 1.0.2 https://f...   Apr 21 2013, 02:32
- - Kamedo2   I visualized IgorC's precious results on the p...   Apr 21 2013, 03:17
- - IgorC   Thank You, Kamedo2. I was thinking to add it but h...   Apr 21 2013, 04:00
- - Gainless   Ok, I've done ABC-HR tests with the samples at...   Apr 21 2013, 15:18
- - IgorC   There are two first samples (01 and 05) those have...   Apr 25 2013, 05:39
- - Gainless   What I don't really get, is why Opus's VBR...   Apr 25 2013, 10:41
|- - jmvalin   QUOTE (Gainless @ Apr 25 2013, 05:41) Wha...   Apr 25 2013, 13:06
|- - Gainless   QUOTE (jmvalin @ Apr 25 2013, 14:06) That...   Apr 25 2013, 14:00
|- - jmvalin   QUOTE (Gainless @ Apr 25 2013, 09:00) Can...   Apr 25 2013, 16:45
|- - Gainless   QUOTE (jmvalin @ Apr 25 2013, 17:45) Depe...   Apr 25 2013, 21:27
- - IgorC   Gainless, Some time ago You have submited one sam...   Apr 25 2013, 21:56
|- - Gainless   QUOTE (IgorC @ Apr 25 2013, 22:56) Gainle...   Apr 25 2013, 22:11
- - IgorC   Yes, it was Project 100 Sample. http://www.hydrog...   Apr 27 2013, 19:35
- - Gainless   Ok, then this is at least clear. What's probab...   Apr 27 2013, 21:11
- - IgorC   Have tried "Iron Man" sample with the ex...   May 11 2013, 19:26
- - Gainless   Igor, you may also take this sample into considera...   May 12 2013, 12:26
- - IgorC   Gainless, Yes, 1.0.2 was better than the experi...   May 12 2013, 21:42
- - Gainless   Maybe some framesize otpimation/detector can be do...   May 13 2013, 20:33
|- - jmvalin   QUOTE (Gainless @ May 13 2013, 15:33) Btw...   May 14 2013, 04:52
|- - Gainless   Sorry^1000 to Jmvalin and Igor, was my fault with ...   May 14 2013, 08:10
- - Gainless   Here's another sample that could benefit from ...   May 23 2013, 17:15
|- - jmvalin   QUOTE (Gainless @ May 23 2013, 12:15) Her...   May 24 2013, 08:43
|- - Gainless   QUOTE (jmvalin @ May 24 2013, 09:43) QUOT...   Jun 2 2013, 21:41
- - ChristianK   Hi, is this the place to also discus the latest ve...   Jun 14 2013, 19:02
- - ChristianK   Well, I'll just go ahead and post my question ...   Jun 16 2013, 22:02
|- - jmvalin   QUOTE (ChristianK @ Jun 16 2013, 17:02) I...   Jun 16 2013, 22:16
- - ChristianK   Yes, I'm curious on how to control the stereo....   Jun 17 2013, 19:10
|- - jmvalin   QUOTE (ChristianK @ Jun 17 2013, 14:10) Y...   Jun 17 2013, 19:25
|- - kabal4e   QUOTE You should replace the second line simply wi...   Jun 18 2013, 23:06
- - ChristianK   QUOTE (jmvalin @ Jun 17 2013, 20:25) Wher...   Jun 17 2013, 21:22
|- - jmvalin   QUOTE (ChristianK @ Jun 17 2013, 16:22) O...   Jun 18 2013, 00:23
|- - ChristianK   QUOTE (jmvalin @ Jun 18 2013, 01:23) You ...   Jun 30 2013, 20:50
- - Bostedclog   Could you tell me which opus encoder we should be ...   Jun 25 2013, 18:00
- - IgorC   Previously I gave a try to new temporal VBR at 48...   Jul 1 2013, 04:40
- - Gainless   A question: Does the tonality detector inside Opus...   Jul 4 2013, 15:03


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