Testing:

MPEG Test using defaults setting
MPEG1 VCD 352x240 CIF, Record 1 min 9.59MB
MPEG2 2.0MB/sec HalfD1 352x480 CIF, Record 1 min 16.3MB
MPEG2 4.0MB/sec FullD1 704x480, Record 1 min 30.8MB
MPEG2 6.0MB/sec FullD1 704x480, Record 1 min 45.2MB
MPEG2 8.0MB/sec FullD1 704x480, Record 1 min 60.0MB
MPEG2 12.0MB/sec FullD1 704x480, Record 1 min 88.4MB
CPU Utilization over all 3 to 5%

MPEG2 clip capture at 704x480 4.0MBit/sec VBR: Record time 30sec size 15MB.
Note: must have a DVD Player install or MPEG2 codec for it to work.
Click Here to Download (Rigth click on the link and Save Target As)
This clip was record from TechTV/Call for Help off my DirecTV S-Video.