[Bug 796232] New: [gstreamer-msdk-master][APL] it will lose frames crossing work with checksum when decode the h264 encoded file by msdk.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796232

            Bug ID: 796232
           Summary: [gstreamer-msdk-master][APL] it will lose frames
                    crossing work with checksum when decode the h264
                    encoded file by msdk.
    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
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//SOCCER_704x576_30_orig_02.yuv '!' videoparse
format=i420 width=704 height=576 framerate=30 '!' videoconvert '!'
video/x-raw,format=NV12 '!' msdkh264enc rate-control=cqp qpi=26 qpp=26 qpb=26
gop-size=30 num-slices=4 b-frames=2 '!' video/x-h264,profile=main '!' h264parse
'!' filesink
location=./SOCCER_704x576_i420_profilemain_rc0_ipb_qp26_slice4_gop30_fps30.h264
3. gst-launch-1.0 -f filesrc
location=./SOCCER_704x576_i420_profilemain_rc0_ipb_qp26_slice4_gop30_fps30.h264
'!' h264parse '!' msdkh264dec '!' videoconvert '!' video/x-raw,format=I420 '!'
checksumsink2 frame-checksum=FALSE file-checksum=TRUE plane-checksum=FALSE
dump-output=TRUE dump-location=./dump.yuv
4. gst-launch-1.0 -f filesrc
location=./SOCCER_704x576_i420_profilemain_rc0_ipb_qp26_slice4_gop30_fps30.h264
'!' h264parse '!' msdkh264dec '!' videoconvert '!' video/x-raw,format=I420 '!'
filesink location=gst.yuv
5. compare the two dumped files, find it lose frames when cross work with
checksum.

This issue can not be duplicated with hevc enc codec

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