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Alex Ashley authored
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. This commit changes it to only free the protection_system_ids on hard resets. https://bugzilla.gnome.org/show_bug.cgi?id=761787
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