[FFmpeg-user] Performance issue/question (maybe my misunderstanding)

[Andrey Utkin]

Try to monitor actual CPU load during transcoding on both PCs. I
suspect libx264 may be not using all 6 cores for all 100% because some
threads have to wait for others to interoperate. Changing x264
threading options may (or may not...) change this result.

I see that you've built ffmpeg manually, and in seemingly same way.
I'd check also libx264 build options - is it built with fine
optimization settings?

Actually
-- 
Andrey Utkin