To many a/v sync problems when trying to cut mpeg2 files, a constant problem
MPEG-VCR will only cut off the ends. So to cut ou a bit in the middle you need to cut off both ends (minus the bit you dont want, and re-join them.
TMPGenc can also edit/trim MPEG2 files but can also have a/v sync problems. M2-Edit is another excellent, yet expensive, mpeg2 editor.