I see that you are ripping BBC DVD. I have quite a few BBC DVDs and most of them are interlaced and not progressive like most other PAL DVD's. Also the field order on a few is totally messed up so cause all sorts of problems when working with them. I guess its just typical that the BBC would use the cheapest bidder to produce their DVDs. You could try ripping the whole DVD to your hard drive first ( setting your prefs in DVDdecrypter not to split files and to have the maximum files size first) and then use VobEdit to strip the streams.