[Bug 793864] New: [gstreamer-msdk-master][SKL] the dumped file of one mpeg2 decoding case has garbage and the ssim value is lower than standard

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793864

            Bug ID: 793864
           Summary: [gstreamer-msdk-master][SKL] the dumped file of one
                    mpeg2 decoding case has garbage and the ssim value is
                    lower than standard
    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: ---

Created attachment 368987
  --> https://bugzilla.gnome.org/attachment.cgi?id=368987&action=edit
99-110 frame pic decoded via gst and yami

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:
============================================
1. build enc as above lists
2. gst-launch-1.0 -q filesrc
location=/media/yami_mpeg2/att_mismatch_att.bits.mpeg2 '!' mpegvideoparse '!'
msdkmpeg2dec '!' videoconvert '!' video/x-raw,format=I420 '!' filesink
location=att_mismatch_att.bits.mpeg2.yuv
3. python ./ssim.py 32 32 132 0 0 att_mismatch_att.bits.mpeg2.yuv
/media/mpeg2_yuv/att_mismatch_att.bits.mpeg2_32x32.I420 -f I420
3. Y_MIN_SSIM=0.853846930261  <= 99
4. observe the dumped yuv file, finding that it has garbage.

uploaded the compared picture between gst-decoding and yamidecoding

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