xvid profile question about threads

[graysky]

I'm using the "XviD: 2pass HQ" template on MeGUI 0.3.0.2017 to downsize some xvid files from HD sizes.

# Set DAR in encoder to 16 : 9. The following line is for automatic signalling
global MeGUI_darx = 16
global MeGUI_dary = 9
AVISource("\\nas\todo\1.avi", audio=false)
LanczosResize(640,352) # Lanczos (Sharp)

My question is about the # of threads I should use for a quad core chip... 4 or 6? x264 has an auto threads (0), but in the profile for xvid, I don't see this option - I have to select an integer.

A value of 6 gave about 104 fps on the first pass and ~70 % CPU time for xvid_encraw.exe.
A value of 4 gave about 135 fps on the first pass and ~50 % CPU time for xvid_encraw.exe.

[Dark Shikari]

Xvid's threading is not very efficient; you'll find that it quickly caps out at relatively low CPU usage and few threads. Moreso, as you've already noticed, more threads gives a higher % of CPU usage, but doesn't necessarily speed up encoding.

[graysky]

I'll just stick to 4 then... thanks for the info.