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Slow-Motion in same shot as non slow motion

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Scott Silvia
Slow-Motion in same shot as non slow motion
on Sep 3, 2011 at 6:11:07 pm

I am shooting a music video this weekend and had a slow-motion question. My current slow-motion workflow is shooting 720p 60fps and conforming it 24 fps. But, last night I was watching some music videos and notices some shots that were most likely shot in 24fps (it did not look like 60fps) in which the first or second half was in regular speed and the other half of the shot switched to slow motion.

I am guessing the original 24fps shot was sent to motion for "optical flow" treatment. What do you guys think?

The effect I am talking about starts at 2:00 in this video.








Thanks.


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Richard Sanchez
Re: Slow-Motion in same shot as non slow motion
on Sep 3, 2011 at 8:12:09 pm

I'm guessing it was either done using speed ramps in Avid (Avid's motion effects and interpolation options tend to give cleaner speed adjustments than Final Cuts frame blending) or it was send to After Effects for time-remapping. Here's a very good tutorial on time remapping in After Effects. http://www.videocopilot.net/tutorials/speed_variation/

Richard Sanchez
North Hollywood, CA

"We are the facilitators of our own creative evolution." - Bill Hicks


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Bouke Vahl
Re: Slow-Motion in same shot as non slow motion
on Sep 4, 2011 at 9:07:23 am

Of course no 'optical flow' is needed!
If the playback FPS is lower than the shooting speed, you still can shoot a higher FPS for slowmo (as you know), and still have 100% speed from the same shot.
Just trash enough frames to get a 1:1 relation to the normal time.
Thus, for Youtube, if you shoot 60 fps, and you edit 30 fps, trashing half the frames yields perfect normal video that can instantly go into perfect slomo.

Bouke

http://www.videotoolshed.com/
smart tools for video pros


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Scott Silvia
Re: Slow-Motion in same shot as non slow motion
on Sep 4, 2011 at 10:45:59 pm

So if I shot in 60fps for a certain shot and dropped that shot into a 30fps timeline, the shot would not look like it is in slow motion? Also, would I just use final cut pro's regular time remapping function and still get good slow motion effects like the ones in the video I presented?


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Bouke Vahl
Re: Slow-Motion in same shot as non slow motion
on Sep 5, 2011 at 3:32:29 pm

Well, now you got the theory.
Why not put it in practice yourself?

IOW, test, see what works for you.
Better and faster than asking others.

Bouke

http://www.videotoolshed.com/
smart tools for video pros


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