[Bug 762933] New: dashdemux: fails to download initialisation segment when switching bitrates

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762933

            Bug ID: 762933
           Summary: dashdemux: fails to download initialisation segment
                    when switching bitrates
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bugzilla at ashley-family.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Occasionally dashdemux switches bitrates but fails to download the
initialisation segment for the new bitrate. This typically causes the decoder
that is downstream of dashdemux to produce numerous decode errors.

As an example, here is part of an HTTP access log:
2016-02-12T16:08:54.623Z/dash2/dash-multi-clear/video6/Header.m4s
2016-02-12T16:08:54.769Z/dash2/dash-multi-clear/audio1/4001040.m4s
2016-02-12T16:08:54.999Z/dash2/dash-multi-clear/video6/4001040.m4s
2016-02-12T16:08:57.831Z/dash2/dash-multi-clear/manifest.mpd
2016-02-12T16:08:58.952Z/dash2/dash-multi-clear/audio1/4001041.m4s
2016-02-12T16:09:02.151Z/dash2/dash-multi-clear/manifest.mpd
2016-02-12T16:09:02.754Z/dash2/dash-multi-clear/video4/4001041.m4s
2016-02-12T16:09:03.162Z/dash2/dash-multi-clear/audio1/4001042.m4s
2016-02-12T16:09:06.012Z/dash2/dash-multi-clear/video4/4001042.m4s

When switching from "video6" representation to the "video4" representation, it
is not downloading video4/Header.m4s.

I have managed to produce a unit test that reproduces the problem, which I will
attach to this ticket. I have not yet managed to work out why it is going
wrong, but I suspect it is related to the manifest refresh, which is set to
happen after every segment.

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