Adobe After Effects Forum
Is this time remapping?
Is this time remapping?
by Jon Shank on Jul 1, 2016 at 4:10:26 am

In this music video:
https://www.youtube.com/watch?v=7qFF2v8VsaA

The speed seems to constantly accelerate up to certain points and then play normal, I think. My eye is too inexperienced to be honest and basically I'm just wondering what exactly they did to achieve the speedy, almost stop motion effect in this video.

action starts around 47s


Re: Is this time remapping?
by Blaise Douros on Jul 1, 2016 at 5:29:04 pm

It's very likely that they recorded the entire video, or at least the portions with lip synching, at half speed (playing the music at half speed so the singer could lip synch correctly), and then doubled the framerate in post. Looking at the amount of makeup effects appearing on the singer, I would guess that some of those speed ramps disguise cuts so they could apply prosthetics. As visual effects go, it's not something you can just emulate in post--as Dave points out, you'd have to plan the entire shoot with this in mind.

This is an extremely cool video, and the effect works great for the creepy demonic look they're going for. I'm going to have to remember this one.


Re: Is this time remapping?
by Jon Shank on Jul 1, 2016 at 7:11:54 pm

Yes! Very cool video.

When you say they double the frame rate:

What frame rate did they likely shoot at originally?

And then, Did they then "Interpret Footage" to twice the original in post? Or did they just alter the speed/duration?


Re: Is this time remapping?
by Jon Shank on Jul 1, 2016 at 7:22:41 pm

Also, here is a short bts I found where you can see a few of the shots of him acting. It does look like he is singing in slow motion.

It might help you glean more info:
https://www.youtube.com/watch?v=6yd4bBVarvI


Re: Is this time remapping?
by Blaise Douros on Jul 1, 2016 at 7:52:01 pm

When you intend to speed the footage up in post, the shooting framerate doesn't matter as much (unless you want very specific looks for the motion blur, in which case you'd shoot at 12 fps or something). You're speeding it up, so you aren't losing frames. You just need to know what the speed of the music was on-set; 50% speed means you double the speed of the video in post.

However, if you intend to slow the footage down, you need to calculate a shooting framerate that is double the mastering framerate: 48 fps for a 24 fps timeline, or 60 fps for a 30 fps timeline, and speed the music up by 200% from its original (Using the Adobe terminology of 100% being the normal footage speed).





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