[Bug 793906] New: [gstreamer-msdk-master][SKL] some cases lose frame during vc1 decoding

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793906

            Bug ID: 793906
           Summary: [gstreamer-msdk-master][SKL] some cases lose frame
                    during vc1 decoding
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zhanjunx.wang at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Test Env:
============================================
Platform:               SKL
Arch:                  x86_64
CentOS Linux release    7.3.1611 (Core)
Kernel:            4.4.0 
libva            MediaServerStudioEssentials2017R3.tar.gz (libva 
                        1.67.0.pre1)
media_driver        MediaServerStudioEssentials2017R3.tar.gz 16.5.2.64009-
                        ubit
gstreamer               master branch 91798e16cc09420163684d13779f13f374164ea2
gst-bad         master branch 1c81bf4bdc67b518d6b3bbc22398c17fe8ced1da


Reproduce Steps:
============================================
take one case for example
1. build enc as above lists
2.  gst-launch-1.0 -q filesrc location=/media/yami_vc1/SA00073.vc1 '!'
'video/x-wmv,profile=(string)advanced,' width=176, height=144, framerate=14/1
'!' msdkvc1dec '!' videoconvert '!' video/x-raw,format=I420 '!' filesink
location=./SA00073.vc1.yuv
3. dump_file_size=912384
4. the yuv file size should be 950400.

Failed cases
decode_vc1/SA00072.vc1 FAIL
decode_vc1/SA00073.vc1 FAIL

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