Subtitles and dual-audio in WebM?
cso...@gmail.com
- Carlos Solís
Matthew Heaney
> As you should know, the WebM format is a subset of Matroska.
Correct, but it has a different doctype: "webm" instead of "matroska".
> The latter is
> able to embed any number of video, audio, and subtitle formats. But I'm
> unsure on how many video/audio/subtitle tracks can a particular .webm file
> contain. As far as I am concerned, it would be one video track, one audio
> track and zero subtitle tracks. Am I right on that?
I think that's what the container standard says. Here's link:
http://www.webmproject.org/code/specs/container/
For now, assume that a webm file has 0 or 1 video tracks, 0 or 1 audio
tracks, and no subtitles. (Work on subtitles, XMP metatdata, etc, is
in work, however.)
-Matt
Steve Lhomme
that a WebM file can only contain one audio stream.
Steve
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Steve Lhomme
Matroska association Chairman
Vladimir Pantelic
> Are these limitations written anywhere ? For example I wasn't aware
> that a WebM file can only contain one audio stream.
I guess by the same reasoning that subtitles are to be kept outside,
a different audio track means a different file served...
Matthew Heaney
> Are these limitations written anywhere ? For example I wasn't aware
> that a WebM file can only contain one audio stream.
If it's not specifically prohibited by the spec, then I guess that
means it's OK. I know the parsers I wrote don't care how many streams
are in the file. The usual rule applies: be conservative about what
you write, and liberal about what you read.
-Matt