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Permit multithread configurations #27

Open alvestrand opened 9 years ago

alvestrand commented 9 years ago

Both VP9 and x264 claim higher performance numbers when multithreading; this is important for the RT case, where encoding speed is the limiting factor.

But target systems have very different numbers of (free) cores, so results at various threading levels might be important to show, not just "max threads".

alvestrand commented 9 years ago

--threads parameter added in #56 for x264 - measurement shows that PSNR drops by 0.3 dB for each 10 threads added (roughly).