Your message dated Sat, 04 Oct 2014 13:34:32 +0200
with message-id <[email protected]>
and subject line Re: Bug#763876: opus-tools: No way to set application
has caused the Debian Bug report #763876,
regarding opus-tools: No way to set application
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763876: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=763876
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Package: opus-tools
Version: 0.1.8-1
Severity: normal
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Hash: SHA512
libvorbis has a tuning option called "application", with values "voip",
"audio" and "low-delay".
opusenc lack ability to apply this tuning.
The tuning option is accessible e.g. from libav.
- Jonas
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Quoting Ron (2014-10-04 02:52:24)
> On Fri, Oct 03, 2014 at 10:06:02PM +0200, Jonas Smedegaard wrote:
>> Here's avconv documentation:
>>
>> $ avconv -h full | grep libopus -A 10
>> avconv version 11-6:11-1, Copyright (c) 2000-2014 the Libav developers
>> built on Sep 13 2014 19:43:14 with gcc 4.9.1 (Debian 4.9.1-13)
>> libopus AVOptions:
>> -application <int> E..A... Intended application type
>> voip E..A... Favor improved speech intelligibility
>> audio E..A... Favor faithfulness to the input
>> lowdelay E..A... Restrict to only the lowest delay modes
>> -frame_duration <float> E..A... Duration of a frame in milliseconds
>> -packet_loss <int> E..A... Expected packet loss percentage
>> -vbr <int> E..A... Variable bit rate mode
>> off E..A... Use constant bit rate
>> on E..A... Use variable bit rate
>> constrained E..A... Use constrained VBR
>
> Yeah the descriptions of those options are the sort of
> oversimplification we were trying to avoid (and even the description
> in the library docs could probably be better now).
I will consider filing a bug against avconv suggesting them to rewrite
to e.g. include a "advanced options - change only if you really know
what you are doing" - I think I have seen such wording at other of their
options (or perhaps that was x264 or vpxenc).
If I do, I will refer to this bugreport - awesome explanations!
...please consider pass that explanation upstream!
> Ok, so the short answer for your case then is most of the time you'd
> just want the "more obvious" options from opusenc, but when you do
> really need to tweak this to do a direct comparison of some special
> mode from another tool you'd indeed use the --ctl option.
I understand. Thanks!
> I believe that libav/ffmpeg does now have their own reimplementation
> of a decoder (I'm not sure if we have that in Debian yet though), but
> most of the quality related things are generally encoder side, so if
> you do find any notable difference that would definitely be something
> worth reporting, since it's likely to be "simple bug" rather than some
> fundamental shortcoming somewhere.
Right. Closing this as a non-bug.
> One other thing to be aware of, depending on how you're doing your
> comparisons, is that opusdec will dither by default, which improves
> the audible quality of low level signals, but does raise the measured
> noise floor. You can turn that off if you need to.
Thanks, but sounds more detailed than the level I will be comparing at.
Would be great in any case if such details was available somewhere - a
perhaps related one is that I have wondered if perhaps there was a
quality difference in downmix stereo to mono in melt or postpone it to
opusenc.
- Jonas
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* Jonas Smedegaard - idealist & Internet-arkitekt
* Tlf.: +45 40843136 Website: http://dr.jones.dk/
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