I found this interesting clip online of a girl spinning an LED hula hoop.
Now right off the bad its obvious footage doesn't look like that to a human eye. You guys got any ideas how I could replicate the footage? What kind of filming techniques are used and so on.
I also found a simple example of a similar LED hula hoop but without the VFX:
I don't think it's a video fx. The first is a different hula loop from the second one. The first one has multicolor leds that are controlled by a micro controller to generate the images you see. It seems to be recorded with a slow shutter to generate the motion blur and add to the effect.
My kids did this one on an iphone.
That was also my first idea but then the dancer would also look blurred, but instead the hula hoop is slow shuttered while the girl remains fluent
Wait there was a hula hoop in that 1st video?
Try https://moodhoops.com/ - that seems like the answer. That and persistence of vision.
I've seen a few of these, I think there's a phone app that does it automatically, but I don't know its name. To do this in a program like Vegas, it is possible but would require a lot more work.
You'd start by masking out the hoop and isolating it, Draw a feathered mask around the outside of the hoop, and use keyframes to follow the hoop as it spins around.
Then you'll have the hoop isolated. Apply a tracer effect to that track, and adjust it until it looks how you want.
From there, you'll have just the isolated hoop, the tracer effect, and a black background. You then put the original video on a track beneath, and you have your dancer unaffected by the tracer effects you are applying to the hoop. You can change the parameters of the effects you have on the isolated hoop track without affecting the video of the dancer/hooper underneath.
Harder than a phone app, but you have a LOT more control over how it looks. You also aren't restricted to video shot by that phone.
This plugin can do the tracer effects for you if you I believe, when combined with the above method. http://www.pixelan.com/sm25/examples.htm
You guys are over-complicating this.
Notice the contrast between the hoop and the rest of the image. Also the first video is 360 res. It has a different look just because of that.
Chroma key the video, duplicate/offset several times, change tracks to additive composite vs alpha & you're set. The original video was recorded ~14fps vs 30, but that would be the way to do it in camera. the result:
BTW, with this I found that Vegas can render 14fps to 30fps & have no interpolation issues on the resulting file, but Youtube make the upload look like amateur furniture building. It took longer to get it in a format YT would accept then it did to edit & render.
because the kids came down I started playing with things because they thought it was awesome. Every other layer disabled.
I'll have to get the kids these hoops and let them make some videos. That's a super-cool effect.