[Bug 762620] New: Playback stutters with avdec_h264 via glimagesink on OSX

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762620

            Bug ID: 762620
           Summary: Playback stutters with avdec_h264 via glimagesink on
                    OSX
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hfink at toolsonair.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 322251
  --> https://bugzilla.gnome.org/attachment.cgi?id=322251&action=edit
*:6 debug logs

When launching the following pipeline: 

gst-launch-1.0 filesrc location=/PATH/TO/claudia_aac.mov ! qtdemux name=mux
mux.video_0 ! avdec_h264 ! videoconvert ! glupload ! glimagesink

we get a few corrupt frames, and then playback stutters heavily. Debug logs are
attached, once for gl*:6, and once for *:6.

The same pipeline would play back smoothly using vtdec_hw instead of avdec_h264
(also not showing corrupt frames in the beginning)

File to play back:
https://www.dropbox.com/s/gwgzsx8t5bvrnyi/claudia_h264.mov?dl=0

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