It looks like this person is asking for the same thing just a couple posts down.
viewtopic.php?f=7&t=61

If that's the case, please close/lock this thread & count me as a +1 vote for that feature

Sorry if this has already been answered, but the search is not cooperating with me. I want my first frame to be captured 6 seconds into the video, but using a standard matrix so that my output collage is a fixed size with a fixed number of frames & doesn't come out 500k pixels long. If I used fi...