With DVD-Shrink you can set the start and end points on any frame and nothing else is touched, i.e. no re-encoding. I would load the entire movie into DVD-Shrink and leave the start point at the beginning and set the end point at the beginning of this 4 second gap and then let Shrink make a DVD out of that. Then, load the entire full DVD in Shrink again and set the start point at the end of the 4 second gap and set the end point to the end of the movie. Then let Shrink make a DVD out of that. Now you will have two DVD's. Use DVD2one to seamlessly merge the two titles/DVD's back into one (it excels at doing that and again, no re-enecoding involved). The only problem is, DVD2one isn't technically freeware I don't think and I don't know if it has a trial version and if so; what the functionality of it would be.