[Bug 796771] New: videodecoder: Don't always drain on gaps/discont

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796771

            Bug ID: 796771
           Summary: videodecoder: Don't always drain on gaps/discont
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This drain was introduced by resolution of the following bug fix:

  https://bugzilla.gnome.org/show_bug.cgi?id=767232

The problem being that OMX and V4L2 only support draining in a way the
reference frames are lost. There is also concerns about FFMPEG and VAAPI
as it means reference frames, which are pushed as read/write, are being
pushed. So in direct rendering, modication of these frames will cause
decoding issues.

In this bug report, it was also stated that this was needed for
TRICKMODE_KEY_UNITS. In this mode, gaps and discont are very unlikely, though
if they appears, skipping to the next immediatly is what one would expect.

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