[Bug 779262] New: VAAPI encoding artifacts

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779262

            Bug ID: 779262
           Summary: VAAPI encoding artifacts
    Classification: Platform
           Product: GStreamer
           Version: 1.11.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ben at setplex.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Hello,

I'm testing VAAPI encoding and I noticed that when encoding with vaapih264enc
it produces a lot of artifacts blocks on scene changes, and quality is not
close to Media SDK's encoding.

My hardware: i7-6700k Skylake
OS: Ubuntu 16.04
vainfo: VA-API version: 0.39 (libva 1.7.3)
vainfo: Driver version: Intel i965 driver for Intel(R) Skylake - 1.7.3
GStreamer: 1.10.3

pipeline:
gst-launch-1.0 -v souphttpsrc location=http://xxxxxx:80/livehd/mpegts ! tsdemux
! h264parse ! avdec_h264 ! queue ! vaapipostproc width=1280 height=720
deinterlace-method=1 scale-method=2  ! videorate ! video/x-raw,framerate=25/1 !
vaapih264enc rate-control=2 bitrate=2000 keyframe-period=50 tune=1 num-slices=2
cabac=true dct8x8=true cpb-length=2000 ! flvmux ! rtmpsink
location='rtmp://xxxxxx:1935/live/live_trans'

the only way you can get better results is when I don't set the bitrate and use
CQP, but in our case I'm trying to use it for streaming and CBR and bitrate
limit is a must.

we tried many different options for vaapih264enc to try to improve quality but
we are getting same results.

How i know it is an encoder issue is because i replace vaapih264enc with
x264enc and then no more quality issues.

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