If the source is analog video tape then crop down to 704x480 (NTSC) or 704x576 (PAL/SECAM) assuming you are capturing at 720 (16 useless black horizontal pixels are added by the capture card to preserve the video frame without risking cutting it off), When you encode to MPEG-2 give pixels an aspect ratio of 10/11 for NTSC and 12/11 for PAL/SECAM for a perfect 4:3 frame, 704 is part of the DVD spec no resizing needed.
If the source is digital then what it is and what aspect ratio and resolution it has?
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