How to properly conform 1080p60p footage for slow motion?

E

ejdge

Well-known member
I'm coming from a FCP background and used to use Cinema Tools to conform my footage for slow motion. I've tried interpreting my 60p footage in Premiere as 24 frames but the output doesn't look smooth and stutters.

I've tried using Twixtor as well and have received much nicer results but do notice some ghosting. What is the proper amount of % that I should slow the footage down when using Twixtor? I realized I only shot with a shutter speed of 60 so I'm not sure how much that affects it.

What is the correct way to do this? Thanks.
 
Create a 23.976p sequence and put the 60p clips into it, then change speed to 40%. Done. No need to conform or "Interpret" footage. Or use 29.97p sequence with 50% slow. Either should be smooth.

Thanks

Jeff Pulera
Safe Harbor Computers
 
Conform the footage to 40% speed when going from 60 to 24p. (It's simple math).

Make sure you're conforming and not re-timing - this varies from NLE.

1/60th shutter will have unusual motion blur... not necessarily 'wrong', but we're supposedly used to a 60th or so motion blur, and when conforming, each frame gets displayed almost twice as long, making blur more "stretched out". Generally "cinematic" blur is about 1/48th (film & shutter angle), for USA video 1/60th (matches the frequency of mains voltage), so 60p it's easiest to double the shutter since you're around 40%... for 1/125 shutter. That's a baseline... creative or lighting issues may make you choose another speed.

Ever accidentally shoot 24p footage at 1/30th or 1/24th? At 24p it has an odd blurry feel... 60p shot at 1/60th can have this, but it's not as pronounced. And you can't shoot with a shutter speed that's slower than your frame rate (think about it - if you shutter is open 60 times a second, it can't be open for a 30th of a second each time...)
 
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