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Sets the number of threads Colormatrix will use for processing. Can be any value greater than 0 and, for YUY2, less than the frame height, for YV12, less than the frame height divided by 2. If set to 0, ColorMatrix will automatically detect the number of available processors and set threads equal to that value
So if you have a dual core processor, with threads=0 then it will use both cores to process the source, with quad core it will use all 4 cores to process the source and so on
I personally set it by hand then you know it really is using all CPU cores, so threads=4 would be the value set on my quad core
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