encoding dvd with custom crop
Suppose I want to crop a homemade 4:3 mp4 video in an unusual manner when converting to NTSC DVD-compliant 16:9 mpeg. For example, suppose I want to cut off the top only (instead of the usual cropping equal portions top and bottom). Is there an easy way to do that?
My first thought was avidemux. However that program has a bazillion options and I don't know which are DVD-compliant. I have tried Google and the instructions I have found for avidemux seem not to match version 2.5.4 which is what I have.
Maybe ffmpeg or mencoder would be better? It would be great if someone could feed me a command-line example which I could modify according to my cropping needs.
Any help would be much appreciated. Thanks!