Author Topic: Optical flow and other "fake slow motion" tricks  (Read 189 times)

hydraulicpresschannel

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Optical flow and other "fake slow motion" tricks
« on: September 15, 2018, 06:55:25 AM »
I just realized that you don't need to buy any expensive plugins to generate missing frames to rise your frame rate in editing. Premier pro has this tool called optical flow that does just that. Here is example video that I made the first clips of each slow motion sequence are played out around 12.5 fps and the software generates every other frame to make that smooth 25 fps https://youtu.be/A6nvM7pYBGc?t=2m25s

I did also same trickery for some 500 fps footage out from 4k phantom camera and if you use 50% speed for the footage, have around 90 degree or faster shutter and simple background it seems to be working really well!

I think I try next to use this same tool for something like 15 000 fps chronos footage and try to make it 30 000 - 40 000 fps footage.

Nikon1

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Re: Optical flow and other "fake slow motion" tricks
« Reply #1 on: September 16, 2018, 04:17:45 AM »
Final Cut has an even better tool, which does that exact thing even better.
But unless you are planing to switch to MAC OS anyways, its propably not worth it for multiple reasons...
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As you said, most of those Tools give best results with idealy Single-Color backgrounds and Fast Shutterspeeds like 90 or 45 or even more.
I got quite solid results interpolating the original footage to up to 4x the original framerate. So like 480fps from 120fps footage. Sometimes you could push it even further.
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Since you have multiple chronos around, did you ever think of building an mirror-Rig to double your Framerate?
Someting Like this:
https://www.youtube.com/watch?v=lItG7LdKO5A
The big advantage the chronos has over someting like the Gopro, that you could trigger it way more accurately in time, so you wont have all that jittering and jumping around in time like with an Gopro. All the shots which where Smooth were basicaly luck, the creator of the video said.
Its basicaly just a Half-Mirror and you film the same exact thing twice with those cameras, but with a shift in time of half a Frame. (Make Sure to use Exact same Settings, same Zoom, same Focus and so on). So Cam A records Its Footage and Cam B records the Frames in between those Frames from Camera A.
"Simpe" way to double your Framerate if you happen to own a spare Chronos (like you) xD
If done Properly it is just as good quality as filmed by a single camera.
Best thing is, if you want to go totaly crazy with this, you could still use Optical flow or Twixtor and alike with this method and get even faster (fake) Framerates.