Pulldown Flag Removal on VC-1 HD-DVD files - Good or bad?

[MGSteve]

I've tried googling for this and I can't find anything on it. Why is removing the pulldown flags a good idea, what do they do?

I appreciate its something to do with framerates etc.. but I thought it was to do with Interlacing?

The Planet Earth HD-DVDs I've got are encoded in 24p, so I wouldn't have though they'd need it?

Update: Now I'm really confused!

I extracted one of the episodes with eac3to, telling to it not to remove the pulldown flags. Now MediaInfo is telling me that the stream is at 29.970fps. Where as eac3to says it is 1080p24!

Which one is right?

[ettin]

I was reading a thread on this in the dgindex forum, apparently its there so that more information can be encoded onto disc (higher quality) and the flags let the DVD player do the pulldown in realtime instead of encoding directly onto the disc wasting space. A moderator claimed it was necessary and that a DVD could not play correctly without it, but the thread OP claimed he had went ahead and burned a 24fps FILM sourced DVD without it and it played fine on a normal DVD player. He upped a sample of the final VOB and the mod confirmed it didnt have any pulldown flags, but then the mod took down the link to it and banned the OP for some reason.

So, i'd say go ahead and burn a disc without the pulldown flags and tell us if it works.

[manono]

I was reading a thread on this in the dgindex forum, apparently its there so that more information can be encoded onto disc (higher quality) and the flags let the DVD player do the pulldown in realtime instead of encoding directly onto the disc wasting space. A moderator claimed it was necessary and that a DVD could not play correctly without it, but the thread OP claimed he had went ahead and burned a 24fps FILM sourced DVD without it and it played fine on a normal DVD player. He upped a sample of the final VOB and the mod confirmed it didnt have any pulldown flags, but then the mod took down the link to it and banned the OP for some reason.

So, i'd say go ahead and burn a disc without the pulldown flags and tell us if it works.
I take it you're referring to this thread:

http://forum.doom9.org/showthread.php?t=141057

Get your facts straight before spreading around this baseless nonsense. First, he wasn't suspended for anything said in that thread, but for 2 Rule 4 violations (which carry 2 strike penalties) within a 30 day period, from 2 different other threads.

Second, the link was removed because it was to porn, as was clearly stated in the thread as the reason for its removal.

Third, the sample without pulldown didn't contain a VOB, but an M2V, very different from DVD Video.

Fourth, saying to go ahead and burn the DVD without pulldown flags is not only bad advice, but probably impossible to accomplish, at least using any decent authoring software. In all likelihood, if he tries to author a 23.976fps MPV/M2V to DVD it'll either be rejected outright or be reencoded either with the flags added, or, more likely, as hard telecined interlaced 29.97fps. All NTSC DVDs must output interlaced 29.97fps (actually 59.94 fields per second).

Edited later for spelling.

[Guest]

Thanks, manono, for setting the record straight. And these people call me a troller. :confused:

The worst part is the outright lie: "He upped a sample of the final VOB..." He never uploaded any fragment of a VOB, even after being asked twice to do so.

The link was not "to porn", but the upload site showed full porn on it's download page. We don't allow such links here, per forum rule 4. Note that I did not strike him for that, although I could have.

[manono]

The link was not "to porn", but the upload site showed full porn on it's download page.
Oh, OK, and thanks for the clarification. I didn't click on the link while it existed, if I ever saw it before it was removed (can't remember now).