[Bug 18960] Define how AudioTrack.id & VideoTrack.id are generated

https://www.w3.org/Bugs/Public/show_bug.cgi?id=18960

Adrian Bateman [MSFT] <adrianba@microsoft.com> changed:

           What    |Removed                     |Added
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         Whiteboard|                            |tpac2012

--- Comment #1 from Adrian Bateman [MSFT] <adrianba@microsoft.com> ---
The HTML5 spec says: "The AudioTrack.id and VideoTrack.id attributes must
return the identifier of the track, if it has one, or the empty string
otherwise. If the media resource is in a format that supports the Media
Fragments URI fragment identifier syntax, the identifier returned for a
particular track must be the same identifier that would enable the track if
used as the name of a track in the track dimension of such a fragment
identifier. [MEDIAFRAG]"

Could we say that is a buffer is initialized with a single video/single audio
track segment then the initial ID is maintained even if subsequent buffers have
a different ID? Then for multi-track segments, the IDs must match. This makes
the IDs predictable if the format includes an ID.

Is there a situation where we might need IDs distinct from HTML5, which allows
an empty string if an ID is not available?

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