Re: Media WG meeting next week

Happy New Year!

I also have a conflict so I cannot attend. Hopefully I'll be able to attend
the next one!

Xiaohan

On Thu, Jan 9, 2025 at 4:41 PM Jean-Yves Avenard <
jean-yves.avenard@apple.com> wrote:

> Hi
>
> Happy new year !
>
> I’d like to add an agenda related to the support of Tracks on SourceBuffer
> with MSE in a worker.
>
> I’ll be lodging an issue today on GitHub.
>
> In short; when the MediaSource was created in a worker, a SourceBuffer
> still expose tracks via AudioTrackList / VideoTrackList / TextTrackList
>
> Track objects are currently only exposed at the Window level.
> An issue was open to expose them at the Worker level
> MSE-in-Workers: {Audio,Video,Text}Track{,List} IDL in HTML need additional
> DedicatedWorker in Exposed · Issue #280 · w3c/media-source
> <https://github.com/w3c/media-source/issues/280>
> github.com <https://github.com/w3c/media-source/issues/280>
> [image: apple-touch-icon-180x180-a80b8e11abe2.png]
> <https://github.com/w3c/media-source/issues/280>
> <https://github.com/w3c/media-source/issues/280>
>
> Our (webkit) proposal is that tracks shouldn’t be exposed in the worker at
> all. It doesn’t make much sense to outside the Window and for text track,
> it’s just not an object that will ever be usable in a Work. TextTrack’s
> cues can only be rendered via DOM.
>
> Considering no User-Agent currently supports tracks in a worker, I
> recommend we stop exposing
> ```
>   readonly attribute AudioTrackList
> <https://html.spec.whatwg.org/multipage/media.html#audiotracklist>
> audioTracks
> <https://w3c.github.io/media-source/#dom-sourcebuffer-audiotracks>;
>
>   readonly  attribute VideoTrackList <https://html.spec.whatwg.org/multipage/media.html#videotracklist> videoTracks <https://w3c.github.io/media-source/#dom-sourcebuffer-videotracks>;
>   readonly  attribute TextTrackList <https://html.spec.whatwg.org/multipage/media.html#texttracklist> textTracks <https://w3c.github.io/media-source/#dom-sourcebuffer-texttracks>;
>
> ```
>
> When in a worker.
>
> Also related: https://github.com/w3c/media-source/issues/281
>
>
>
> On 10 Jan 2025, at 4:02 am, Chris Needham <chris.needham@bbc.co.uk> wrote:
>
> Hi Media WG,
>
> There's a WG meeting scheduled for Tuesday next week, but I'll be away
> this time.
>
> The agenda is currently empty, but looking at current activity in GitHub,
> these might be candidates, although I'm not sure they really need in-person
> discussion:
>
> Https://github.com/w3c/mediasession/pull/350
> <https://github.com/w3c/mediasession/pull/350>
>
> https://github.com/w3c/webcodecs/issues/857
>
> Suggestions for other topics welcome!
>
> Many thanks,
>
> Chris
>
>
>