off topic? webM how many audio tracks?

6 respostas [Última entrada]
karsten harazim
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Joined: 09/16/2022

anyone out there who knows where to find information about how many different audio tracks can be includen in webM videos?

jxself
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Joined: 09/13/2010

Just like the Matroska container, of which WebM is subset, there is not a limit.

karsten harazim
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Joined: 09/16/2022

do you know any tool that makes it convenient to author such?
clips of 20sec
how is it possible to select audio tracks when published on webpage?

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> Am 23.10.2022 um 15:22 schrieb name at domain:
>
> Just like Matroska container, of which WebM is subset, there is not a limit.

jxself
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Joined: 09/13/2010

"do you know any tool that makes it convenient to author such?"

FFmpeg?

"how is it possible to select audio tracks when published on webpage?"

That's a different question. What the file format supports and what the playback programs implement are different issues. I know VLC has an Audio menu where you can select the audio track.

Magic Banana

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Joined: 07/24/2010

I did once a WebM video (of a RMS talk, after I invited him in my university) with two audio tracks (English and Portuguese). I did it on Trisquel 7. At that time, avconv was ffmpeg's substitute. I reported the command I used in https://libreplanet.org/wiki/Adding_media_to_GNU_Audio-Video#Video_editing :
$ avconv -i en.webm -itsoffset 00:00:02.88 -i pt.webm -c copy -map 0:v -map 0:a -map 1:a -metadata:s:a:0 language=English -metadata:s:a:1 language='INSERT-YOUR-LANGUAGE' -metadata title='INSERT-YOUR-TITLE' combined.webm
At that time (2017), I then wrote:
However if published on the Web, it is better to publish the two videos, with one audio-track each, because Web browsers do not allow to switch between audio-tracks.

iShareFreedom
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Joined: 12/20/2021

Maybe in the WebM documentation you can find how many different audio tracks can be includen in webM videos.

https://www.webmproject.org/docs/container/

Ark74

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Joined: 07/15/2009

> do you know any tool that makes it convenient to author such?

Why not use something like kdenlive, the backports repository has a fairly new release there.