[Bug 695968] New: playbin: don't show subtitles by default, or only if explicitly signalled to do

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=695968
  GStreamer | gst-plugins-base | git

           Summary: playbin: don't show subtitles by default, or only if
                    explicitly signalled to do
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: t.i.m at zen.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


See bug #690911.

If there are subtitles, they should probably not be enabled by default unless
there is some signalling from the demuxer/file that they should be enabled.


Step 1: playbin should default to subtitles=off
=============================
As it says. Should be trivial to implement.



Step 2: let demuxers signal which streams are the default
===================================

We then need to figure out some signalling so that demuxers can tell playbin if
one of the streams is the 'default' stream, and if so which. Could be done via
by adding a flags argument to the stream-start event. See attachement 232879 of
bug #600648 for a tentative patch.

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