Hi all,
I'm developing a H264 streaming server relying on VA-API.
The machine is an Intel Celeron J1900 running Lubuntu 15.04 (64bit) with
libva 1.6.0, libva-intel 1.6.0 and gstreamer-vaapi 0.6.0.
I'm using gstreamer-vaapi to get rid of the NAL header management and
I'm using a reference video available on youtube at the following link:
https://www.youtube.com/watch?v=h9FL_FclLuU
I'm able to sample the video at 1920x1080@30fps with a dedicated HW
providing YUV420 raw images.
The chain works fine encoding in "Constant QP" mode (the actual bitrate
rises up to 24 Mbps).
The whole frame processing time is around 2.7 ms and the vaEndPicture
execution time is around 2.6 ms.
However if I encode in "Constant bitrate" mode (let's say 4Mbps), the
whole frame processing time rises up to 29.3 ms and the vaEndPicture
execution time rises up to 29.2 ms.
Such a time prevent me to switch at 1920x1080@60fps (16.7 ms per frame)
with constant bitrate.
Is there any tweak or suggestion you could provide?
Thanks
Regards
Pierluigi
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