[Bug 793868] New: [gstreamer-msdk-master][SKL] 3 cases lose frame during mpeg2 decoding

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793868

            Bug ID: 793868
           Summary: [gstreamer-msdk-master][SKL] 3 cases lose frame during
                    mpeg2 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_mpeg2/tcela-14-bff-dp.short.bits.mpeg2 '!' mpegvideoparse
'!' msdkmpeg2dec '!' videoconvert '!' video/x-raw,format=I420 '!' filesink
location=tcela-14-bff-dp.short.bits.mpeg2.yuv
3. dump_file_size=1555200
4. the yuv file size should be 2073600 according to yamidecode.

Failed cases
decode_mpeg2/tcela-14-bff-dp.short.bits.mpeg2 FAIL
decode_mpeg2/tcela-8-fp-dp.bits.mpeg2 FAIL
decode_mpeg2/twilight_zone_mei_MEI2.stream17.mpeg2 FAIL

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