Recovering The Original Moving Image Sequence After A Frame Rate Conversion
There is a lot of film-based material available today, which was "spoiled" by frame rate conversion in order to fit old analog transmission or presentation systems. It is sometimes possible, and makes sense to recover it to its original state before presenting to the viewer.
First, if there was frame mixing involved, it is most likely that recovery is impossible. This can also happen when there were several rate conversion steps involved, such as 24 Hz film converted to 60 Hz video, and then from 60 Hz video to 50 Hz video (a typical mistake and a typical example how it should not be done).
24 Hz material, converted to 25 Hz, can be recovered in a straightforward manner by slowing it down. Sound conversion is harder, because it is hard to guess if tone adjustment was used during initial conversion.
24/1.001 Hz material can be conversely sped up to 24 Hz. Sound is usually not a problem because of the small difference in speed.
24/1.001 Hz material, converted to 60/1.001 Hz, can be recovered using the reverse 3:2 pulldown technique.
Recovering video-based material usually does not make sense - it either looks good, or is spoiled for good.
Read more about this topic: Moving Image Formats
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