[Bug 776979] New: vaapidecoder resets too much on input caps change

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776979

            Bug ID: 776979
           Summary: vaapidecoder resets too much on input caps change
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: thaytan at noraisin.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

bug 770921 made vaapidecoder do a full reset when set_format() is called, but
causes a new problem by unconditionally resetting the decoder when not needed.

I have a fragmented MP4 file, where the H.264 is continuous but the caps change
periodically because the calculated framerate changes from fragment to
fragment. That's a by-product of the fact that MP4 doesn't store framerate
explicitly, so we have to guess it and the guess can be inaccurate.

The test file can be found at
https://www.dropbox.com/s/l34m9vhw8zlj69m/test-fragmented-videotestsrc.mp4?dl=0

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