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intel / intel-vaapi-driver

VA-API user mode driver for Intel GEN Graphics family
https://01.org/linuxmedia
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Why H264 Encoder is slower than H265 Encoder? #354

Open qiushics opened 6 years ago

qiushics commented 6 years ago

#184

Does vaapi driver have some difference on SKL?

xhaihao commented 6 years ago

The driver uses legacy media kernels on HSW. the new kernels are used on BDW+.

xhaihao commented 6 years ago

Are you using the latest version of intel-vaapi-driver on SKL?

qiushics commented 6 years ago

@xhaihao I used the lastest version of SKL, the performance of H264 increased, but the speed of H265 encoder decreased when compared to the old driver. I also compare the new driver on both HSW and SKL. HSW has better H264 encoder performance.

The result updated as below:

VAAPI Driver CPU Encoder FPS
1.7.0 i7 4770 H264 250fps
1.7.0 i7 6700 H264 108fps
1.7.0 i7 6700 H265 126fps
2.1.1.pre1 i7 4770 H264 250fps
2.1.1.pre1 i7 6700 H264 200fps
2.1.1.pre1 i7 6700 H265 64fps
qiushics commented 6 years ago

when I use libva-util sudo intel_gpu_time avcenc 1920 1080 ~/mediatest/1080p.yuv /dev/null

HSW:

encode 683 frames in 3.152886 secondes, FPS is 216.6
user: 0.932000s, sys: 0.400000s, elapsed: 3.154074s, CPU: 42.2%, GPU: 72.6%

SKL:

encode 683 frames in 3.694241 secondes, FPS is 184.9
user: 2.300000s, sys: 1.132000s, elapsed: 3.697099s, CPU: 92.8%, GPU: 52.6%

It seems that SKL can't full utilize the GPU.

xhaihao commented 6 years ago

I used the lastest version of SKL, the performance of H264 increased, but the speed of H265 encoder decreased when compared to the old driver.

The quality of the new H265 encoder is far better than the old H265 encoder on SKL.

I also compare the new driver on both HSW and SKL. HSW has better H264 encoder performance

A simple media kernel is used on HSW however a more complicated media kernel is used on SKL, the quality of the h264 encoder on SKL is far better than the h264 encoder on HSW.

sudo intel_gpu_time avcenc 1920 1080 ~/mediatest/1080p.yuv /dev/null

intel_gpu_time only measures the utilization of the render ring, actually it is not a good tool for measuring GPU utilization.

qiushics commented 6 years ago

@xhaihao Thanks. I know the problems is that the performance is related to the quality encoder. So, should I use GPA to for measuring GPU cost?

xhaihao commented 6 years ago

@qiushics I am not familiar with GPA, please access https://software.intel.com/en-us/gpa for help.

qiushics commented 6 years ago

ok, thanks

vengateshvengi commented 4 years ago

As now i am working in ffmpeg with HW acceleration for converstion of mpeg2video to H264 using vaapi in Ubuntu .Converstion is working good but it takes more cpu usage in (wa). I had followed this link https://gist.github.com/Brainiarc7/24de2edef08866c304080504877239a3 Please guide me to avoid cpu usage in (wa).