Dollas the start time is literally start time and the length is the length of gif you wanted to make
eg: you want a gif from 3:32 - 3:36
put 3 into the minute box and 32 into the second box and 4 for "Length"
crop the video at the viewable region.
adjust the frame size until the dimension reaches 125X 125 (for avi).
then adjust other features until you're satisfid with the result
