[Bug 783023] New: [KBL/APL/SLK][media/libva][AVC Encode CBR Multi-Slice] the output bitrate compare to the input target bitrate bigger than 10% by using gstreamer as tool.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783023

            Bug ID: 783023
           Summary: [KBL/APL/SLK][media/libva][AVC Encode CBR Multi-Slice]
                    the output bitrate compare to the input target bitrate
                    bigger than 10% by using gstreamer as tool.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: fei.w.wang at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

System Environment
=======
1), HW:
SKL
CPU: Dual core; Genuine Intel(R) CPU @ 1.10GHz
GPU: PCI ID 8086:191e
Memory: 4G
2), SW
Libva 1.8.2.pre1
Libva- intel-driver 1.8.2.pre1
Libdrm    2.4.68
xf86-video-intel 2.99.917
Kernel    Linux kernel - 4.10.0-rc2 
OS    14.04
libyami    1.1.0
Regression?
No
=======
Bug detailed description
=======
most of mulit-sclies test cases: encoded (output bitstream bps - input
bitstream bps)/input bitstreamer bps are bigger than 10%

Reproduce Steps
==============
1, To run avc ipb encode with multi-slices=2 on SKL platforms; 
#CBR
#gst-launch-1.0 -v filesrc location=stockholm_1280x720_604.yuv '!' videoparse
format=i420 width=1280 height=720 '!' vaapih264enc rate-control=cbr
bitrate=1000 keyframe-period=30 num-slices=1 max-bframes=2 '!' filesink
location=./stockholm_1280x720_604.yuv-1000-2-cbr-gop30-slice2.h264 
2, To check whether the (output bitstream bps - input bitstream bps)/(input
bitstreamer bps) * 100% < 10%

Expected Result
=============
All test cases were executed and encoded (output bitstream bps - input
bitstream bps)/input bitstreamer bps are successfully controlled in 10%

Actual Result
===========
almost of encoded bitstream by using gstreamer are bigger than 10%

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