[Bug 698851] New: Need playbin to be able to play multiple audio and text streams simultaneously

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=698851
  GStreamer | gst-plugins-base | git

           Summary: Need playbin to be able to play multiple audio and
                    text streams simultaneously
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: self at brendanlong.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


See: https://bugs.webkit.org/show_bug.cgi?id=103771

QtWebKit, WebKitGTK and EFLWebKit all use GStreamer for audio and video
elements. The HTML5 spec requires that we be able to play multiple audio and
text streams simultaneously, but playbin only allows us to select one.

Sebastian Dröge suggested:

> Some ideas for the implementation would be 1) allowing the application to set a N->1 "stream combiner" element on playbin for the A/V/T streams, or 2) some API to select between selection/mixing and allow to set different mixing options (volume per audio stream, video stream positions/scaling, ...)

I'm not sure if this would be enough for text tracks, since we can't just mix
them, we need to be able to tell them apart. Maybe a stream combiner could do
that though.

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