Environment: CPU:SNB Libva: (vaapi-ext)baa1c0e18619e23c30e26240a087f6ce95c089df Intel-driver:(vaapi-ext)7eeb6c9233d1c63d83b578bfca4f292eac8d320c ==================================== Description:Use avcenc to encode a 1080P yuv file to a h.264 file at 2Mbps, the quality is bad.You will find some garbage MB especially for I frames. Besides, the real bitrate is not 2Mbps. It's about 3.9Mbps ==================================== Reproduce step: 1.avcenc 1920 1080 blue_sky_1080p.yuv /tmp/1.264 fb=2000 mode=1 2.use mplayer to play the encoded file, you will find some garbage MB especially for I frames.
Will you please try the latest intel-vaapi driver and see whether the issue still exists? Thanks
Yes. I tried with latest gsteamer-vaapi-master / gsteamer-vaapi-0.6 branch and intel-vaapi driver on intel baytrail (lenevo B50 touch laptop). Quality becomes bad for below options vaapiencode_h264 rate-control=cbr bitrate=2048 . It is very easy to reproduce. 1) Pick up any video file which is 1080 h264 and it has lots of motions (not still picture) 2) Run any gst-launch-1.0 pipeline with |vaapiencode_h264 rate-control=cbr bitrate=2048| option. You will surely see it.
This is a known limitation of Baytrail CBR. No plans to change it in that older platform at this time.
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