[Bug 657062] New: oggdemux: do not skip sparse streams when determining start times

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=657062
  GStreamer | gst-plugins-base | unspecified

           Summary: oggdemux: do not skip sparse streams when determining
                    start times
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vincent.penquerch at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Except Skeleton, which does not have data packets, and which headers
always have 0 granulepos.

This fixes demuxing of streams containing only sparse streams,
which would cause an infinite loop in _read_end_chain.

This reverts 64dfad46f29799f99cfe10178556c361bd9918ff, which does
not give a rationale for the change nor a test case it fixes, so
this commit might break something. Playing/seeking on the Sintel
movie works fine though, so it seems good so far.

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