[Bug 785664] New: It has some little quality drop compared with ww26’s gstreamer-vaapi version when run avc cbr encode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785664

            Bug ID: 785664
           Summary: It has some little quality drop compared with ww26’s
                    gstreamer-vaapi version when run avc cbr encode
    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: zhanjunx.wang at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Created attachment 356685
  --> https://bugzilla.gnome.org/attachment.cgi?id=356685&action=edit
bitrate-psnr curve

Test Env:
============================================
Platform:       SKL
Arch:           x86_64
libva            b65a3d9deacb72bd9f96d3e023d4f8ed58bd8d0a (1.8.4 pre1)
libva-intel    7f50a13b4eb93ddd2a52b2ebb1c2f7554c23ccb8 (1.8.4 pre1)
gst-vaapi    8a7354380c62ce65fd20e2a491fff60582407844


Reproduce Steps:
============================================

1.gst-launch-1.0 filesrc location=${media_streams_path}/${filename} !
videoparse format=$format width=${WIDTH} height=${HEIGHT} framerate=${fps} !
vaapih264enc rate-control=cbr bitrate=${bps_avg} ${gopsetting}
num-slices=${slice} max-bframes=${b_frame_num} !
video/x-h264,profile=${profile} ! h264parse ! filesink location=./${testname}
2.bitrate_real=`echo "scale=2;$filesize*8*$fps/1024/$framenum"|bc`
3.yamidecode -i ./$testname -m 0 -f I420
4.YSNR_reference=`$tools_path/metrics_calc_lite.${ARCH} -i1
$media_streams_path/$filename -i2 dump.yuv -w ${WIDTH} -h ${HEIGHT} -nopfm psnr
y |awk -F '<' '{printf $2}' |awk -F '>' '{printf $2}'`
5.draw bitrate-psnr curve 

detail info please view attachment

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