[FFmpeg-devel] [PATCH v4] Improved the performance of 1 decode + N filter graphs and adaptive bitrate.

[Michael Niedermayer]

On Mon, Feb 11, 2019 at 05:41:04PM -0500, Shaofei Wang wrote:
> It enabled multiple filter graph concurrency, which bring above about
> 4%~20% improvement in some 1:N scenarios by CPU or GPU acceleration
> 
> Below are some test cases and comparison as reference.
> (Hardware platform: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz)
> (Software: Intel iHD driver - 16.9.00100, CentOS 7)
> 
> For 1:N transcode by GPU acceleration with vaapi:
> ./ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi \
>     -hwaccel_output_format vaapi \
>     -i ~/Videos/1920x1080p_30.00_x264_qp28.h264 \
>     -vf "scale_vaapi=1280:720" -c:v h264_vaapi -f null /dev/null \
>     -vf "scale_vaapi=720:480" -c:v h264_vaapi -f null /dev/null
> 
>     test results:
>                 2 encoders 5 encoders 10 encoders
>     Improved       6.1%    6.9%       5.5%
> 
> For 1:N transcode by GPU acceleration with QSV:
> ./ffmpeg -hwaccel qsv -c:v h264_qsv \
>     -i ~/Videos/1920x1080p_30.00_x264_qp28.h264 \
>     -vf "scale_qsv=1280:720:format=nv12" -c:v h264_qsv -f null /dev/null \
>     -vf "scale_qsv=720:480:format=nv12" -c:v h264_qsv -f null /dev/null
> 
>     test results:
>                 2 encoders  5 encoders 10 encoders
>     Improved       6%       4%         15%
> 
> For Intel GPU acceleration case, 1 decode to N scaling, by QSV:
> ./ffmpeg -hwaccel qsv -c:v h264_qsv \
>     -i ~/Videos/1920x1080p_30.00_x264_qp28.h264 \
>     -vf "scale_qsv=1280:720:format=nv12,hwdownload" -pix_fmt nv12 -f null /dev/null \
>     -vf "scale_qsv=720:480:format=nv12,hwdownload" -pix_fmt nv12 -f null /dev/null
> 
>     test results:
>                 2 scale  5 scale   10 scale
>     Improved       12%     21%        21%
> 
> For CPU only 1 decode to N scaling:
> ./ffmpeg -i ~/Videos/1920x1080p_30.00_x264_qp28.h264 \
>     -vf "scale=1280:720" -pix_fmt nv12 -f null /dev/null \
>     -vf "scale=720:480" -pix_fmt nv12 -f null /dev/null
> 
>     test results:
>                 2 scale  5 scale   10 scale
>     Improved       25%    107%       148%
> 
> Signed-off-by: Wang, Shaofei <shaofei.wang at intel.com>
> Reviewed-by: Zhao, Jun <jun.zhao at intel.com>
> ---
>  fftools/ffmpeg.c        | 112 +++++++++++++++++++++++++++++++++++++++++++++---
>  fftools/ffmpeg.h        |  14 ++++++
>  fftools/ffmpeg_filter.c |   4 ++
>  3 files changed, 124 insertions(+), 6 deletions(-)

breaks fate
make: *** [fate-lavf-mxf_d10] Error 1
make: *** [fate-filter-tremolo] Error 1
make: *** [fate-filter-chorus] Error 1
make: *** [tests/data/hls-list-append.m3u8] Error 1
make: *** [fate-filter-atrim-mixed] Error 1
make: *** [fate-filter-atrim-time] Error 1
make: *** [tests/data/live_last_endlist.m3u8] Error 1
make: *** [fate-filter-volume] Error 1
make: *** [fate-filter-join] Error 1
make: *** [fate-lavf-mxf] Error 1
make: *** [fate-swr-resample-s16p-44100-8000] Error 1
make: *** [fate-swr-resample-s16p-44100-2626] Error 1
...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

"Nothing to hide" only works if the folks in power share the values of
you and everyone you know entirely and always will -- Tom Scott

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