[Bug 796528] New: Negotiation with cabac=true stopped working after 794306

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796528

            Bug ID: 796528
           Summary: Negotiation with cabac=true stopped working after
                    794306
    Classification: Platform
           Product: GStreamer
           Version: 1.14.1
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vrichter at posteo.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Problem:

After the changes made to fix Bug 794306 negotiation with cabac=true and
h264parse stopped working. When cabac is set to false, the pipeline works.

Reproduce:

Working: gst-launch-1.0 -v videotestsrc ! vaapipostproc ! vaapih264enc
cabac=false ! h264parse ! fakesink dump=true num-buffers=1

Not Working: gst-launch-1.0 -v videotestsrc ! vaapipostproc ! vaapih264enc
cabac=true ! h264parse ! fakesink dump=true num-buffers=1

stdout: https://github.com/GStreamer/gstreamer-vaapi/files/2079804/out.log
stderr: https://github.com/GStreamer/gstreamer-vaapi/files/2079805/err.log

The builds are from 1.14 branches of the github repos.
The pocessors tested: 
* Intel(R) Core(TM) i5-3337U CPU @ 1.80GHz
* Intel(R) Core(TM) i7-6700T CPU @ 2.80GHz
* Intel(R) Core(TM) i5-4250U CPU @ 1.30GHz

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