As one example of this problem, I input a PAL DVD that contains 4 chapters of 32 mintues in length. Tagged on as the 5th chapter is an 8 minute video clip. The Time code is 32 and 8 minutes, respectively and is one title. When I play this PAL DVD using PowerDVD it says the DVD has 5 chapters and is 40 minutes.
ConvertXtoDVD does not create a 40 minute contiguous video. It is confused by the two different timecodes of the two clips. This is an outstanding problem of CXD on mishandling many custom made DVDs which includes different clips with different timecodes.
You have to clean up the input before converting from PAL to NTSC. What I have to do is first demux the PAL streams in DVD-Lab, then rebuild the GOP timecode, then burn a PAL DVD. I use that as my input to CXD and I get a good conversion.