Force film fails?

[daxab]

What would make force film fail? In general, I've seen zero interlaced frames when using force film on a regular movie. But I just did an encode of Girlfight and I noticed that at one spot, halfway through the movie, several interlaced frames snuck through.

Anyone else seen this? What gives? What exactly does force film do anyway -- how does it go about extracting progressive frames?

[Kedirekin]

I believe what force film does is simply ignore the RFF/TFF flags in the DVD's mpg stream. And I believe when it comes across a section of video that is NTSC (i.e. doesn't have any RFF/TFF flags), it simply decimates frames to ensure a framerate of 23.97 fps.

Most movies are >99% FILM, and if any of the <1% NTSC is in the movie proper, it's in short bursts of a few frames. If any interlacing sneaks through, it's gone too fast to notice (unless it's at scene changes, and the field order is wrong - like Stargate SG1, sheesh!).

But remember that Force Film is selected when the dvd2avi project file shows >95% FILM - up to 5% of the movie might be NTSC (for a 2 hour movie, that's as much as 6 minutes). If any of this ~5% shows up in large blocks of frames, there is a distinct chance you'll notice interlacing.

And to answer the first part of your question, I certainly have seen this. I remember on Eldorado (the Disney flick), in the ships brig just before they start planning their escape, the video dropped into full NTSC for about 5 or 10 seconds. I had to IVTC the whole movie just for those 5 or 10 seconds - very irritating.

[Djuby]

Kedirekin,

I am trying to do Stargate SG-1 and so far no luck. The final video plays jerky or it has too many int. frames. I am using the Big 3 method. I've tried almost every kind of settings. The closest I've been is progressive output but jerky playback or playback like the original but visible int. frames. Any ideas will be greately appreciated. Thank you in advance.

[r6d2]

IMHO, when struggling too much against a bad telecine, irregular force filming or plain hybrids, it may pay back just to forget about that and encode interlaced. You will not notice any artifact which was not there in the source, and it will play smoothly.

This (http://www.doom9.org/ivtc-tut.htm) guide may be useful on the topic.