[Libva] Horizontal stripes on low bitrates

[Sreerenj]

HI,
I can't reproduce the mentioned issue- "distorted video output with 
horizontal stripes" in my Haswell ,
but I hit some other issues while enabling cbr mode encoding..
Could you please file a bug against gstreamer-vaapi in gnome bugzilla,
https://bugzilla.gnome.org/enter_bug.cgi?product=gstreamer-vaapi

On 27.06.2015 21:46, ValdikSS wrote:
> Hello!
> I'm running libva 1.5.1 and libva-intel-driver 1.5.1 on Sandy Bridge.
> If I encode any video with low (< 8 Mbit/s) bitrate I get very distorted video output with horizontal stripes in it. This is a case for both cqp and cbr encoding.
> I've tried to encode it with gstreamer 1.0, avcenc and h264encode with same output result.
>
> This is what I get with 3000 Kbit/s CBR encoding:
> http://ovrload.ru/f/55938_bake-cbr-3000.mkv
>
> It was encoded with the following gstreamer pipeline:
>
> gst-launch-1.0 -e filesrc location=bake_op.mkv ! matroskademux ! vaapidecode ! videoconvert ! video/x-raw,format=NV12 ! vaapiencode_h264 rate-control=cbr
> bitrate=3000 ! video/x-h264,stream-format=byte-stream ! h264parse ! matroskamux ! progressreport ! filesink location=bake-cbr-3000.mkv
>
> Windows encoders like MediaCoder and handbrake produce decent video quality without horizontal stripes. Nothing different with current git master of libva and
> libva-intel-driver.
>
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> Libva at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/libva

-- 
Thanks
Sree

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