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Darth Mallwalker said:
That "inserting/removing frames" bit has always scared me from using Force Film.
I've usually chosen 'Ignore' instead because I don't want any frames removed. Do I?
Why would one want frames removed? Wouldn't it cause herky-jerky playback?
I just don't understand why or when, under what conditions Force Film might decide to remove some frames.
And when/why would frames be inserted? Where would the inserted frames come from? Repeats? Again sounds like a recipe for herky-jerky motion to my pea brain.
Is it even safe to use Force Film?
Using forced film is fine if your material reads as over 95% film in DGIndex, which it should do if you dealing with an NTSC movie. Movies start life as 24fps, and this is, by and large, how they are stored on the DVD. Pulldown flags instruct the player to turn this 24fps (actually 23.976) into the 30fps (actually 29.97) required by all but the most modern TVs for playback. Removing the flags restores leaves the original 24fps in place and does not create jerky motion because when you re-encode after editing your encoder adds the pulldown flags back (assuming you choose the correct settings).
Sometimes material is stored on the DVD with the pulldown already in place. If there is enough of this material on the DVD, then forced film might leave blended frames because it removed the pulldown incorrectly. In this case you choose "Honor Pulldown Flags" and write an Avisynth to restore the original 24fps (inverse telecine) another way.
The "Ignore Pulldown Flags" option is meant for power users as a testing mode. It is a mistake to select it if you don't really know what you are doing.
In short, use Forced Film unless you encounter a problem. If you do encounter a problem, use "Honor Pulldown Flags" and inverse telecine in Avisynth.