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Add slice threading support, use the command like:
./ffmpeg -i input -vf colorlevels -f null /dev/null
with 1080p h264 clip, the fps from 39 fps to 79 fps
in the local(Intel(R) Core(TM) i5-8265U CPU @ 1.60GHz)
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
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Signed-off-by: Paul B Mahol <onemda@gmail.com>
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lrint avoids an implicit cast, and is not slower on non-broken libm's. Thus this
represents a Pareto improvement.
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
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Signed-off-by: Paul B Mahol <onemda@gmail.com>
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Signed-off-by: Paul B Mahol <onemda@gmail.com>
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