There isn't HW decoding for 10 bit stuff yet. When you choose DXVA decoding, it should fall back to regular software decoding.
In general for madvr, if you're struggling with scaling algorithms being too slow, your best bet is to use software decoding only to move load from GPU to CPU. Additionally, many GPUs get locked to a lower clock when doing video decoding by the driver.
If you care about power consumption/noise, you probably shouldn't be using the fancier madvr algorithms anyway.
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