[Bug 13359] <track> A way is needed to identify the type of data in a track element

https://www.w3.org/Bugs/Public/show_bug.cgi?id=13359

--- Comment #40 from Bob Lund <b.lund@cablelabs.com> 2012-02-01 15:59:49 UTC ---

(In reply to comment #39)
> It does seem unnecessarily complicated.

All for possible simplification.

> For the usage described (enabling a
> script to find its metadata track), all that's needed is to expose a single
> string from the track to the script. For WebM the contents of the track's
> CodecID element would be appropriate and sufficient. 

If CodecID provides the same information as TrackType, e.g. distinguishes
between subtitle and control, then I agree. Otherwise it seems TrackType
provides essential information in determining a text track type.

>For Ogg, the contents of
> the 'name' field should be enough. Similar simplifications for the other
> formats should be possible.

According to [1], "Role describe what semantic type of content is contained in
a track" and "This field (Name) provides the opportunity to associate a free
text string with the track". If only one of these fields can be provided I
think Role would be more appropriate as it's values are defined. However, Role
still doesn't fully identify the type of data in, for example, text/metadata,
so it seems Name could be useful.

> 
> Comment #37 seems to be trying to create a feature that exposes a subset of the
> container-specific per-track metadata to script, which is overkill for the
> use-cases described in comment #0. IMHO.

[1] http://wiki.xiph.org/SkeletonHeaders

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Received on Wednesday, 1 February 2012 15:59:59 UTC