Here's a test I did

I encoded 1 min of NTSC TV (29.97) in both Huffy and Morgam MJPEG

When I encoded both to XviD (2-Pass), I noticed a performance difference.

Encoding speeds are as follows:

XviD encoded the Huffy Capture at 20-30 FPS (Almost Realtime, it took 1:15s to encode each pass.)

XviD encoded the MJPEG Capture at 35-45 FPS (WAY faster than realtime. Took an about 30-38s to encode each pass)

I know many individuals that have been able to encode at 50-60 FPS. How can I achieve this?