How to change high speed video to normal speed?

[lindseynic0627]

My assistant shot some video footage on our Canon XC15. Unfortunately, somehow the button on the touch screen to capture high speed video was accidentally selected halfway through the clips. The video was captured at 120x's regular speed. Most of the clips do not even appear to be 1 second, and play very quickly. I've tried slowing them down by adjusting the speed/duration in Premiere Pro. Can't seem to find the right speed (too slow or too fast) and it's very choppy. Does anyone know of anything else I could try to solve this issue? Even if I could get them to look somewhat "slow" and at a normal rate? Any settings I could possibly change anywhere? I feel like I've tried everything and I was curious if there was anything I could do in After Effects, but I am not familiar with the program at all. Just getting comfortable with Premiere Pro. Thank you in advance.

[Dave_LaRonde · Accepted solution]

Here's the problem -- you don't have enough frames of video to make video at smooth, normal speed.. 

If the video runs 120 times faster than it should, that means the camera recorded one frame every four seconds. You don't stand a chance of making smooth motion out of it.  You have just one picture for every four seconds!

So give that assistant a dope slap and plan on a re-shoot.  You really don't have any choice.

[lindseynic0627]

Ok, thank you. I figured after trying a lot, there was no hope. Thanks!

[A.I.1]

Can't seem to find the right speed (too slow or too fast) and it's very choppy

While it won't fix it, depending on what's in the shot, you could try things "Pixel Motion" ("Layer->Frame Blending->Pixel Motion") or frame blending after slowing it down - that should make it less choppy after slowing down - but likely will give artefacts. Plug-ins like Twixtor (additional cost and more complex) might also help in interpolating it to make it smoother.

Also surely the capture rate will tell you how much you'd need to slow it down (assuming it's a constant capture rate).

capture high speed video was accidentally selected halfway through the clips

It sounds more like "slow speed video" was selected. Capturing high speed video would shoot more frames than normal but this seems more like less frames than normal was shot (eg. for time-lapse type shooting).