[Bug 761787] New: qtdemux: seek fails with CENC encrypted streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761787

            Bug ID: 761787
           Summary: qtdemux: seek fails with CENC encrypted streams
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bugzilla at ashley-family.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When playing a stream that has been protected by DASH CENC, playback will fail
if a seek is performed. Qtdemux produces the error "stream is protected using
cenc, but no cenc protection system information has been found" and playback
stops.

The problem is that gst_qtdemux_reset() gets called as part of the FLUSH during
a seek. This function frees the protection_system_ids array. When
gst_qtdemux_configure_protected_caps() is called after the seek has completed,
the protection_system_ids array is empty and qtdemux is unable to create the
correct output caps for the protected stream.

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