Detection of interlaced/progressive material

I've been using DVD-RB for some time now and it's coming on brilliantly - every bug I have come across has been swiftly stamped out and I haven't had a problem with it for ages - thanks jdobbs! The thing I can't get my head around is how DVD Rebuilder detects progressive/interlaced material. Previously I used the Big3 to do my backups and that was a royal pain in the ass for this. I'm in PAL land so with 99% of DVDs the main movie is progressive and extras are interlaced (and normally 4:3 aswell). It wasn't that difficult but basically they had to be manually set - even if DoItFast4U detected them right, BatchCCEws wouldn't apply the settings it had detected meaning manually configuring P/I sources. I can't see it being something simple otherwise surely the Big3 would be able to do it properly plus I've seen plenty of discussions mentioning how hard it is to make software that can correctly identify PAL interlaced/progressive material. Also I know that the header flags in PAL stream are almost always full of crap and have everything down as interlaced. So how does DVD-RB do it??

the difference is he doesnt try to figure out the prog/interlace nature of the origional. jdobbs encodes the stream .. then actually puts the origional flags back into the stream. the difference is he created his own d2v parcer that creates a d2v and a flag file.. the origional is encoded from raw frames.. then the flags are added back to your new video file. using the origional flags is simple in theory..but not implementation. hats off to him for coming up with the idea AND putting in the coding work to make it happen don graft is making a dvd2avidg that will allow a similar thing to be possible with all encode methods (big3 included)...

:cool: Thanks.