tytool but can't get rid of line on top of screen

[DoNuts]

i have a modified direct tv tivo and using tytool to extract video, edit out commericial.. convert to vob file.. however when play back on computer there is a dashing lines on top of screen...need help to get rid of that.. thanks

[Jamie]

See this (http://www.dealdatabase.com/forum/showthread.php?t=43465&highlight=vertical+blanking+interval[/url) and the earlier posts it references for a discussion.