[Bug 796467] New: msdk: the dumped file has garbage in every frame when decode the mpeg2 encoded file

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796467

            Bug ID: 796467
           Summary: msdk: the dumped file has garbage in every frame when
                    decode the mpeg2 encoded file
    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:               APL/KBL
Arch:                  x86_64
Linux release           16.04
Kernel:            4.12.0-rc2 
libva                   https://github.com/01org/libva.gitb
                        commit 3be72a5a110880f70626d7c3bed953cdde124b2
media_driver        https://github.com/intel/media-driver
                        commit 1c2b0615d749c45c07f9aee6586774816989c5b3
MediaSDK:               https://github.com/Intel-Media-SDK/MediaSDK
                        commit 7c2b069dce7bed268806f680412a2f3b09a52ce9
gst-bad         master branch 0bdcf51baf77926b4f29c01a2fdf133c13aad62e

Reproduce Steps:
============================================
take one case for example
1. build enc as above lists
2. gst-launch-1.0 -f filesrc
location=/media/encoderbitstreams//720p5994_parkrun_ter.yuv '!' videoparse
format=i420 width=1280 height=720 framerate=30 '!' videoconvert '!'
video/x-raw,format=NV12 '!' msdkmpeg2enc rate-control=cqp qpi=26 qpp=26 qpb=26
gop-size=30 b-frames=0 '!' mpegvideoparse '!' mpegtsmux '!' filesink
location=./720p5994_parkrun_i420_profilemain_rc0_ip_qp26_slice1_gop30_fps30.mpg
3. gst-launch-1.0 -f -q filesrc
location=./720p5994_parkrun_i420_profilemain_rc0_ip_qp26_slice1_gop30_fps30.mpg
'!' mpegvideoparse '!' msdkmpeg2dec '!' videoconvert '!' ximagesink

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