CPU Selection for video encoding
The DV encoder used in the cited test is useless for gauging modern CPUs.

I ran the test command with the referenced media on a 4-core i5 and the difference between -threads 4 and -threads 3 is 0.5% and with -threads 2 is 1%. I see a much larger variance when I use H.264 encoding.

Of course, the bigger flaw is that the command is resizing the video. FFmpeg's internal scaler isn't multi-threaded!