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Mixing frame rate? Best to go UP or DOWN?

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Daniel Fourie
Mixing frame rate? Best to go UP or DOWN?
on Nov 7, 2016 at 3:26:33 pm

Hello,

Just out of interest. What would be best for quality, having a 25fps video in a 29fps sequence and then rendering with 29fps settings (going UP), or having a 29fps video in a 25fps sequence and then rendering with 25fps settings (going DOWN)?

Thanks :)


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Chris Wright
Re: Mixing frame rate? Best to go UP or DOWN?
on Nov 7, 2016 at 3:33:55 pm

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-tric...

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)


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Daniel Fourie
Re: Mixing frame rate? Best to go UP or DOWN?
on Nov 7, 2016 at 3:40:25 pm

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


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Chris Wright
Re: Mixing frame rate? Best to go UP or DOWN?
on Nov 7, 2016 at 4:00:42 pm

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.


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Ann Bens
Re: Mixing frame rate? Best to go UP or DOWN?
on Nov 7, 2016 at 4:13:11 pm

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

-----------------------------------------------
Adobe Certified Expert Premiere Pro CS6/CC
Adobe Community Professional


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Jeff Pulera
Re: Mixing frame rate? Best to go UP or DOWN?
on Nov 7, 2016 at 4:55:09 pm

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


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Daniel Fourie
Re: Mixing frame rate? Best to go UP or DOWN?
on Nov 7, 2016 at 9:00:38 pm

I live in a PAL country, thank you!


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Jeff Pulera
Re: Mixing frame rate? Best to go UP or DOWN?
on Nov 7, 2016 at 9:48:53 pm

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


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