[Bug 793525] New: msdk: encoder: Enabling b-frame causes failure in every non-transcoding pipeline

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793525

            Bug ID: 793525
           Summary: msdk: encoder: Enabling b-frame causes failure in
                    every non-transcoding pipeline
    Classification: Platform
           Product: GStreamer
           Version: 1.13.1
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bsreerenj at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Encoding is broken if we enable B-frames in specific pipelines.

Issue is reproducible with:
DISPLAY=:0 gst-launch-1.0 videotestsrc num-buffers=300  ! msdkh264enc
b-frames=2 ! filesink location=sample.264

The transcode pipeline (decode ! encode) works just fine.
Seems to be a regression introduced by VideoMemoryBufferpool patches.

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