Mixing frame rate? Best to go UP or DOWN?

[Chris Wright]

that is the best question I have seen in 10 years!

more frames = more information. interpolation software can use the extra frames to not introduce as many artifacts with optical flow.
https://blogs.adobe.com/creativecloud/optical-flow-time-remapping-tips-tricks-for-best-results/

but remember, each framerate has their own look and technical sides.

for example, some people don’t even interpolate, they slow down 25 to 23.976 and add 3:2 pulldown to get 29.97fps.(keeps the film look on dvd players with a little judder)

[Daniel Fourie]

Thank you for the information, you didn’t answer my question though?

[Chris Wright]

smooth motion
1. going from 29.97 to 25fps produces less artifacts so it is what I would recommend if you go the optical flow route.
caveat! – 25 to 29.97 is possible but produces more artifacts.

maintain film look with zero artifacts.
2. you can avoid optical flow technology altogether and slow down 25fps to 23.976 and then add 3:2 pulldown.

so….

the answer literally depends on what look you want.
1. smooth motion with less artifacts
2. film look with zero artifacts with slight studder like watching a dvd movie.

[Ann Bens]

Mixing those two has always been a pain.
Going up or down depends on which country you live in.

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[Jeff Pulera]

To expand on Ann’s comments, do you live in a PAL or NTSC country? While frame rate doesn’t matter as much for online/computer viewing, if you wish to make DVD or Blu-ray discs, then you want to stick with the local flavor of frame rate for playback and display compatibility, so that would be my first consideration. Meaning 25fps for PAL, or 29.97 for NTSC.

Thanks

Jeff Pulera
Safe Harbor Computers

[Daniel Fourie]

I live in a PAL country, thank you!

[Jeff Pulera]

In that case, you should be better off using a 25fps sequence and exporting 25fps. The clips will match up better if some frames are removed from the 29.97fps footage to match the 25fps footage, rather than trying to duplicate/create frames from nothing to get 25 up to 29.97

Thank you

Jeff