opus - Jul 2015 - mjr to opus audio conversion - corrupted results

Hi Mark,

Well, so do you think that any of this libraries probably won't provide
correct audio conversion? Do you know any other possible solutions for
described problems, ommiting trying to fix on my own any of this libraries
or waiting for fix? Will you mind if I quote you in disscussion I
mentioned? Sorry for asking you so many questions at once.


Regards,

Mateusz

2015-07-08 17:42 GMT+02:00 Mark Harris <mark.hsj at gmail.com>:
> Hi Mateusz,
>
> The Ogg Opus container does not have explicit per-packet timestamps,
> and so doesn't allow gaps in the audio.  PLC packets may be generated
> to replace any packets that were lost or corrupted, as described in
> section 4.1 of the specification:
> https://tools.ietf.org/html/draft-ietf-codec-oggopus-08#section-4.1
> These packets usually consist of just a single TOC byte.  It looks
> like the tool you are using does not do this, and does not replace
> gaps with anything.  Unfortunately FFmpeg has a similar issue:
> https://trac.ffmpeg.org/ticket/3391
>
>  - Mark
>
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Hi Mateusz,

It looks like the Janus code that writes Ogg Opus will not produce
correct Ogg Opus output when there are packets missing.  You can quote
me or https://tools.ietf.org/html/draft-ietf-codec-oggopus-08#section-4.1
if you wish.  If you have another way to convert these files to Ogg
Opus or a way to write the Opus audio to webm instead then that might
be a workaround.

 - Mark

Thanks a lot. Well, the problem is that it's hard to find any informaton
about converting *.mjr files. I'll keep trying.

Regards,

Mateusz

2015-07-09 0:57 GMT+02:00 Mark Harris <mark.hsj at gmail.com>:
> Hi Mateusz,
>
> It looks like the Janus code that writes Ogg Opus will not produce
> correct Ogg Opus output when there are packets missing.  You can quote
> me or https://tools.ietf.org/html/draft-ietf-codec-oggopus-08#section-4.1
> if you wish.  If you have another way to convert these files to Ogg
> Opus or a way to write the Opus audio to webm instead then that might
> be a workaround.
>
>  - Mark
>
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