[FFmpeg-devel] [PATCH v3] lavfi/qsvvpp: support async depth

[Zhong Li]

Fei Wang <fei.w.wang at intel.com> 于2021年3月31日周三 上午10:11写道：
>
> Async depth will allow qsv filter cache few frames, and avoid force
> switch and end filter task frame by frame. This change will improve
> performance for some multi-task case, for example 1:N transcode(
> decode + vpp + encode) with all QSV plugins.
>
> Performance data test on my Coffee Lake Desktop(i7-8700K) by using
> the following 1:8 transcode test case improvement:
> 1. Fps improved from 55 to 130.
> 2. Render/Video usage improved from ~61%/~38% to ~100%/~70%.(Data get
> from intel_gpu_top)
>
> test CMD:
> ffmpeg -v verbose -init_hw_device qsv=hw:/dev/dri/renderD128 -filter_hw_device                 \
>  hw -hwaccel qsv -hwaccel_output_format qsv -c:v h264_qsv -i 1920x1080.264                     \
> -vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \
> -vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \
> -vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \
> -vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \
> -vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \
> -vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \
> -vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null -
>
> Signed-off-by: Fei Wang <fei.w.wang at intel.com>
> ---
> Change:
> 1. Add test data in commit message.
> 2. Rmove some duplicate code.

LGTM and applied. Thanks.