[Bug 786802] New: vaapidecode: h264: fix nal aligned streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786802

            Bug ID: 786802
           Summary: vaapidecode: h264: fix nal aligned streams
    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: orestisf1993 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, orestisf1993 at gmail.com,
                    vjaquez at igalia.com
     GNOME version: ---

Running the following pipeline:

gst-launch-1.0 filesrc location=CI_MW_D.264 ! h264parse ! video/x-h264,
stream-format=byte-stream, alignment=nal ! vaapih264dec ! vaapisink

seems to show only a single frame while the pipeline works correctly with au
alignment:

gst-launch-1.0 filesrc location=CI_MW_D.264 ! h264parse ! video/x-h264,
stream-format=byte-stream, alignment=au ! vaapih264dec ! vaapisink

A quick workaround seems to be to not mark the GST_H264_NAL_AU_DELIMITER units
as AU and FRAME START which makes the above pipeline work but the problem still
persists for other files such as BAMQ1_JVC_C.264.

Files from ITU-T_H.264.1(2016-02)_AVCv1_bitstreams.zip from
https://www.itu.int/net/itu-t/sigdb/spevideo/VideoForm-s.aspx?val=102002641.

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