[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

go4dream <lmaag42 at googlemail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |lmaag42 at googlemail.com

--- Comment #5 from go4dream <lmaag42 at googlemail.com> ---
Use case PGS:
http://forum.doom9.org/showthread.php?p=1659305#post1659305

To support PGS tracks of type 3. in matroska the track must be marked as
forced. Therefore all subtitles should be displayed for tracks marked as forced
regardless of whether specific subtitles are flagged forced or non-forced.

PGS tracks of type 1. could be handled in matroska by setting the "default"
flag of this track so it will be pre-selected. In this case only the subtitles
flagged as forced should be displayed. But the user should be able to switch on
displaying all subtitles (also non-forced).

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