I am doing a music video and I want to make it appear that the subject of the video is slow motion, but still in sync with the music. I’ve seen other videos online that do this and am hoping it’s some sort of effect I can apply… it would essentially be taking a frame, and then copying that frame to the next 2,3,4,5 (6,7,8,etc) frames to make it appear to lag, then repeat with the next sequential frame. The video stays in sync with the audio but it creates a jittery effect. Has somebody already done this?
Hi Dave, Can you provide a link to a video that uses this effect ?
I could probably use the code in my latest “persistence” filter to produce what you are looking for. It would be quite easy to do and I could “keyframe” the amount of jitter. I will have a go later today.
There are a few ways to make jitter effects.
The ones demonstrated here are easiest to create with Shotcut. There are many more jitter effects that need motion control. Those can’t be done with SC yet.
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That rolling stones video isn’t really what I was looking for. I want it to look kind of like overcranking, but instead of being a smooth playback it would be stuttering a little bit. Stutter might not be the right description. To give you some context, I’m also applying this with sepia and some of the old film filters (dust, scratches, projector). I actually really like the way it looks previewed. It’s not rendered yet prior to export, so the video skips frames, but when I export to mp4, it’s smooth and I actually think the way it looks prior to export actually looks cool.
Maybe another way to think of this would be to think what would happen if I shot the video at something slow like 8 FPS… it would not look smooth on playback, but the music would still be synced correctly (I have the music recorded on a separate track).
As @MusicalBox has suggested posting a link to a video along with the timestamps you want us to look at will help us understand.
Okay, I continue to look for what I want, and I think the effect essentially is a “stop motion” effect. Here’s a video of somebody doing EXACTLY what I want using another app. https://www.youtube.com/watch?v=phmsWIErvVo They even are adding sepia like I am to make it look like an older film.
I have created a “jitter” filter that I think does what you are asking. If you would like to try it and let me know if that is what you were looking for it can be found here: http://www.elusien.co.uk/shotcut/filters/
The instructions on how to install it for Shotcut on your system are included on the webpage - Enjoy!
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Looked at the video.
You want a posterize time effect.
Can be done.
Using the jitter filter by @Elusien you can make a very reasonable posterize time effect.
Nice job. Another fine filter.
Great! Especially on how quick the turnaround was! 
The advanced keyframes though have a problem where they literally go off the scale when the values are changed. Here’s a demo.
Thanks for pointing this out. The keyframes code has been giving me problems with several filters. It is my understanding of that code rather than the code itself. I found a bug in the way I was doing things and fixed that, but it looks like I’ve introduced another in doing so. I’ll look into it, but it may have to wait till tomorrow.
You’re welcome! You do great work so I’m excited to test out the filters you post!
Have you seen the bug regarding the Sniper filter that I pointed out yesterday here?
Again, it’s my misunderstanding of how the slider position interacts with the slider scale, e.g. % = x100 the parameter range e.g. 0.1 to 1.0, the slider value and the parameter value.
It’s a case of me now doing some experiments to nail down the various equations once and for all. When I’ve finally done that I’ll update all my filters.
That jitter filter from Elusian worked perfectly! That’s it exactly! Might want to rename it though to something more accurate like “stop motion” or “posterize time”. Thank you for the quick turn around! Is there a catalog of all unofficial filters out there somewhere?
I have put all of mine on my website at: Shotcut - Elusien's Contributions
along with other resources such as HTML Overlays, webGL transitions, video credits and CSS3 animation support.
@sauron has collated some for people to download - see:
Combining the Jitter filter along with Elusien’s other filter, Persistence, can achieve some pretty interesting effects.
Here’s a demo I just did with both Jitter and Persistence:
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yeah, that’s cool!
Wow, @sauron, that is brilliant. Plus I love that song!! GREAT WORK!! @elusien, these are 2 brilliant filters!! Thank you so much.
It’s spooky - I was working on a similar effect myself over the last few days. I’ve called it the JUMP effect, and I did it not with filters but using Shotcut in conjunction with an AutoHotKey script. Here’s a very short demo showing the effect. I’m just making a short tutorial on how I did it. Will post the tutorial and AHK script asap.