That nominal analog blanking shit always confused me,althor1138 said:
Huh. I looked at the script and it seems I resized it to 860x720 before adding borders and it probably should have been 960x720.
but I would've thought 704 --> 960
or 720 --> 982-ish if you like to keep the overscan.
Don't get discouraged! You can worry about that some other day...