[Bug 755115] New: dashdemux: relate wall clock time to timestamps for live streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755115

            Bug ID: 755115
           Summary: dashdemux: relate wall clock time to timestamps for
                    live streams
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: thiagossantos at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently dashdemux uses the availabilityStartTime to match timestamps of a
live stream with the real world clock. It seems this is not a requirement. See
"http://live.unified-streaming.com/loop/loop.isml/loop.mpd?format=mp4&session_id=50375".

This stream fails to play because it tries to play from the first segment that
would correspond to 'now' in the wall clock but the mapping is completely wrong
so it never finds such segment.

Is there an official way to match timestamps to real world time? Or should we
invent a way to do it? Like get the last segment end as 'now' at the beginning
of the stream and use that as a base?

Ideas?

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