lavfi/hqdn3d: add slice thread optimization
Enabled one thread per plane, used the test command for 1080P video (YUV420P format) as follow: ffmpeg -i 1080p.mp4 -an -vf hqdn3d -f null /dev/nul This optimization improved the performance about 30% in 1080P YUV420P case (from 110fps to 143fps), also pass the framemd5 check and FATE. Reviewed-by:Paul B Mahol <onemda@gmail.com> Reviewed-by:
Moritz Barsnick <barsnick@gmx.net> Signed-off-by:
Jun Zhao <barryjzhao@tencent.com>
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