downside to converting 60fps to 24fps

J

Jason B.

New member
I thinking of shooting a project at 60fps so I can conform the footage to 24fps for slow motion and rendering down the regular-speed footage to 24fps for that film look.

Are there drawbacks to rendering down 60fps footage to 24fps
 
The biggest drawback is that if you want to make 60p look good, you have to use a 1/120th shutter speed. This is to get the desired motion blur.
If you then slow that footage down to 24p (regular speed playback), you end up with 24p with a 1/120th shutter speed. This will end up in 'jittery' motion, with too few motion blur between the frames. For some scenes this might fit the bill, (war, action scenes) but for most it will look a bit strange.
 
Stab, why do you say 1/120th is needed for 60p? I have always shot 60p with a 1/60th shutter. I also have exported the finished product as 24p and it looks very nice as 1/60th is not far away from 1/48th. Edius does a great job with this.

Shooting in 60p is safe as it gives you options in the editing stage if you do not know the framerate of your deliverable.
 
Bassman2003 That's because the proper shutter to use for 60p slow motion is 1/120 . Using 1/60 does not yield "smooth" slow motion.

Stab...I believe you are mixing things up. When one actually shoots at 24p with a 1/120 shutter and above you will get that jittery (Saving Private Ryan) look. But when shooting 60p with 1/120 and then slowing down the footage 1/120 would be a proper 180 degree shutter for 60p. For 24p the proper 180 degree shutter would be 1/48. But 1/60 is good enough for government work (jk).

EDIT: BUT..if you are just converting 60p to 24p (without slowing it down)...then you will have issues with the motion I believe. Not too noticeable though (IMO).
 
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Ian-T said:
Bassman2003 That's because the proper shutter to use for 60p slow motion is 1/120 . Using 1/60 does not yield "smooth" slow motion.

Stab...I believe you are mixing things up. When one actually shoots at 24p with a 1/120 shutter and above you will get that jittery (Saving Private Ryan) look. But when shooting 60p with 1/120 and then slowing down the footage 1/120 would be a proper 180 degree shutter for 60p. For 24p the proper 180 degree shutter would be 1/48. But 1/60 is good enough for government work (jk).

EDIT: BUT..if you are just converting 60p to 24p (without slowing it down)...then you will have issues with the motion I believe. Not too noticeable though (IMO).
Click to expand...

Indeed, that's what I meant. For slowmo 60p with 1/120th is great. When just converting to 24p, you get that staccato effect.
 
IMO I think the perfect starting place for regular/slow mo is 120 fps. Or even 96 or 48p. This way it stays in multiples of 24 and one could speed up or slow down without any real issues.
 
I had a project like this. I ended up shooting everything in 24p except the shots we knew we were going to slow down. Those we shot with 60p.
 
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