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Just leave the affinity to the default (all CPUs). MP itself does almost all of it's work in one main thread (rendering etc.). There are few things that actually benefit from dual (more) core CPUs.


- Video decoding (audio can be decoded on other CPU, this is handled by directshow automatically as it has multiple threads)

- Some video codecs are able to use multiple cores (ffdshow multicore build(?) and CoreAVC.)


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