[Bug 770331] player: Implement a playlist API and next/previous commands

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770331

Edward Hervey <bilboed at bilboed.com> changed:

           What    |Removed                     |Added
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                 CC|                            |bilboed at bilboed.com

--- Comment #12 from Edward Hervey <bilboed at bilboed.com> ---
(In reply to Olivier Crête from comment #8)
> 
> > > I'm also not sure I understand what the auxilliary
> > > URIs are for? Only external subtitles? Anything else? How do you know which
> > > is which if you have more than one?
> > 
> > That's basically preparation for playbin3 :) Right now we can only have a
> > single suburi, with playbin3 you can have multiple subtitles, external audio
> > tracks, etc. With the streams API you would be able to know what to do with
> > them.
> 
> How can playbin3 know which URI is what? For example, if you have multiple
> srt files, you'd need to be able to say which language it is, same for
> external audio. So this API seems to be missing something.

Very good point. We might need (at the playbin3 and urisourcebin level) to have
a way to provide extra meta-data for those additional URI (like language, audio
mapping, 3D positioning, ...).

As for knowing which URI is what (i.e. correlate them in the resulting
GstStreams), maybe provide a specific stream-id ?

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