What you seem to be asking is how to go from 1080/25p (or 1080/50i) to either 1080/23.98p or 1080/59.94i. The answer in either case is the same. Either an HDCam SR or one of the recent HDCam models can play back 25p as 24p (or, in your case, 23.98). By doing this, the material is slowed down by about 4%, but there are no artifacts as the frames are not being interpolated. You can then either record this on another VTR as 1080/23.98, or you can convert it to 1080/59.94i, which is done by adding 3:2 pulldown (this is also available in the VTR as a playout option). Either way, it's basically just a tape dub once you create a 1080/25 master. You might need to convert your sound tracks (the same 4% pull down is available in Pro Tools and other sound editing programs) and do a new layback, but that depends on the capabilities of the VTR you use for playback.
Another way to accomplish this is to render out a 1080/25p Quicktime movie, and use Cinema Tools to conform it to 23.98. You can then play it out directly to a 1080/23.98 tape master.
Yeap! Those are the best ways of taking care of this. No one can see or hear the 4%.
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