How to reverse field order on completed DVD

[dokworm]

I created a DVD and stupidly deleted the source files.
However I got the field order back to front so of course it is unwatchable.

Is there any way to reverse the field dominance (order) without having to recompress and lose quality?

[setarip_old]

Hi!

The following information regarding "ReStream" may be useful:

http://www.digitalfaq.com/dvdguides/capture/atimpeg/restream.htm

[dokworm]

Isn't there any way to edit the VOB headers directly and change the TOP_FIELD_FIRST value from 1 to 0?

[dokworm]

After thinking on this for a while I figured I am more likely to get an answer if I ask the question in a different way, (as anyone that knows how to edit a header could help me vs someone who knows about field reversal) can I get this thread moved to one of the DVD authoring forums and have a new thread title?

Or unlock the other one (http://forum.doom9.org/showthread.php?t=123800) and lock this one?

[neuron2]

I've moved it as you requested.

But be aware that there is no such thing as a "VOB header".

You need to reflag the elementary MPEG2 stream. I don't know of any tools that can do that directly on a set of VOBs.

But maybe you'll get lucky and somebody else knows of something.

[manono]

As far as I know also, you'll have to Demux. ReStream can switch the field order for you.

[dokworm]

That means I'd also have to redo the menus etc. as well wouldn't it?

They are a very complex and very deep set of menus unfortunately.

Hmm, I'll have to do some more reading and write the proggy myself by the look of it.

[manono]

No, you won't have to redo the menus. Demux with PGCDemux, change the field order with ReStream, remux using Muxman, and stick it back into the original DVD using VobBlanker.

[dokworm]

Thanks heaps, I'll try it out and see if that works!

[dokworm]

So far so good, got it demuxed and run through restream. Dumped the resultant video out to DV as a quick check and verified that the fields are indeed now around the right way.
Remuxed it no problem with Muxman.
Just reading up now on vobblanker to see how to put it back into the original DVD structure.

Thanks again Manono

[dokworm]

The video played back perfectly, but my chapters are all screwed up, so I've done something wrong, I'll have another go in the morning.

[manono]

When authoring using Muxman, did you load the Celltimes.txt that PGCDemux gave you (File->Import Chapters)? If so, and then when replacing using VobBlanker, the chapters should wind up in the same places.

[dokworm]

Thanks, that worked a treat!