[Bug 755159] implement GstStreamFlags bit to mark forced streams, e.g. forced subtitles

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755159

Jan Schmidt <thaytan at noraisin.net> changed:

           What    |Removed                     |Added
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                 CC|                            |thaytan at noraisin.net

--- Comment #4 from Jan Schmidt <thaytan at noraisin.net> ---
Generally, a forced subs track should be selected by default, but in
forced-only display mode, so that only the specific subtitles marked forced get
displayed, and preferring the user's language setting when choosing between
multiple forced tracks.

We don't have API for enabling a subtitle track in forced-subs-only mode, so
we'll be needing that too - it's not enough for matroska to just announce that
the track contains forced subtitles - we need to tell the subs renderer not to
draw the whole shebang.

For DVD subtitles, this is done by the VM sending an event downstream to
dvdspu, but that's because the DVD VM knows whether to be in forced-only mode
or not.

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