Thanks for the suggestion, but I can't call WinAPI functions from the command line, and the encoding is made from a batch (.cmd) file only. Anyway, I've found the solution: powercfg.exe. That should work fine with all versions of Windows.
If you wish, you can write a small program to automate the change when a certain program is running (or, IMO, better: when the CPU usage remains high for a long time). I'm sure it will be very useful to others, and perhaps also to me, but I don't need it for BD3D2MK3D. Thanks anyway.
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