24p to 60p Conversion?

[Coleft]

Hello,
Maybe an odd question, but I am looking for a way to convert my film grain scans from 23.976fps to 60fps, so that when I use it as a Matte in Davinci Resolve. That way, when I throw it back over to premiere in an XML, it will slow down correctly when overlayed onto a 60p clip slowed to 24p.
I tried speeding the grain clip up 250% and exporting as 60p, but when I pull it back onto a 24p timeline and slow it down to 24p it is just as choppy, as if I never exported it as 60p.

Any ideas? Would love a way to do it inside of premiere if possible so I can export in a lossless format to retain as much detail as possible.
Thank you for any suggestions!

[Selur]

No clue about the tools you used, but:

I tried speeding the grain clip up 250% and exporting as 60p, but when I pull it back onto a 24p timeline and slow it down to 24p it is just as choppy, as if I never exported it as 60p.

No surprise, you first changed the time each frame is displayed and then changed it back.

Any ideas?

Looking at https://theblog.adobe.com/optical-flow-time-remapping-tips-tricks-for-best-results/ you probably are simply using the wrong frame interpolation method. When going from 24 to 60 frames per second your playtime should stay the same and your frame count should increase to create a slow down effect during playback.

[poisondeathray]

what is your "film grain scan" ? Is it a grain plate ? To add grain to your composition?

What format is it in ? Image sequence? Prores /MOV, something else ?

When you interpret the footage in PP, the slowdown just changes the playback rate with the same number of frames. It's 1:1 in terms of frames . If you had 100 frames, you have 100 frames after, just instead of 59.94p, it plays back at 23.976p

So one way to do this in PP is to use nested sequences
1) interpret the grain clip as 59.94 (right click in the project bin => modify => interpret footage)
2) place grain clip in it's own 59.94 sequence (e.g right click in the project bin => new sequence from clip will make this a 59.94p sequence with same characteristics)
3) in the main sequence timeline (23.976), drag the new 59.94 sequence (not clip) to the timeline (PP will "see" this nested sequence as a 59.94p video, so it will "drop" frames to conform it to a 23.976 timeline. ie. you will be "missing" frames at this point)
4) right click the 59.94p sequence on the timeline, make sure time interpolation is set to "frame sampling"
5) right click, speed/duration 40% . You should see the 59.94 sequence extend in length. So it's back to 1:1 frames , as if you natively slowed down a 59.94p video to 23.976