[Bug 768903] New: dashdemux: Cannot switch audio codec

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768903

            Bug ID: 768903
           Summary: dashdemux: Cannot switch audio codec
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: sh.yang at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Whenever I try to change audio track, it causes not-linked flow return error.
Note that this content consists of two different audio codec without video.

gst-play-1.0
http://download.tsi.telecom-paristech.fr/gpac/DASH_CONFORMANCE/TelecomParisTech/mp4-live-group/mp4-live-group-mpd-A-NBS.mpd

When playbin2 used, the first try of audio track change worked, but the next
try of audio track change causes error.
In case of playbin3, it does not works, even the first try of audio track
change.

I wanna ask that whether configuring demuxers per AdaptationSet is the best
approach... I'm not sure how to handle this in case of playbin2, but playbin3
can handle dynamic codec change. In this context, isn't it better to configure
only one demux per media type if it is re-usable? (e.g., only one demux for
video, and the other demux for audio)

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