Motion Tracking, making a solid line/shape from a bezier mask

chris-h wrote on 7/21/2019, 8:05 AM

I have successfully tracked and masked the end of the barbell with a blue circle in this clip.
How can I make a solid line/shape from all the masks/tracking points.
I want it to start as a circle on the first frame on the end of the barbell and as the clip progresses, subsequent masks are added, resulting in a line to see exactly where the path of the bar went during the lift.
I'm guessing it's not that complicated but I'm stumped as to how to even begin!
Thanks for any info/advice.

Comments

fr0sty wrote on 7/21/2019, 1:32 PM

If you use the "attach motion capture data to PIP" script, you can apply a picture in picture effect to any image and it will copy the motion tracking data to that image.

chris-h wrote on 7/21/2019, 4:46 PM

Thanks for the reply, but I really don't know what you mean by this.

fr0sty wrote on 7/21/2019, 7:09 PM

Sorry, misread your question. There is no easy way to do this, unfortunately, that doesn't completely defeat the purpose of using the motion tracking to begin with. The way I'd do it is to mask out a solid color media generator until I have a line, then reveal it slowly by keyframing the mask as the video plays to make the line grow, until it draws itself on screen the way I wanted it to.

What you are trying to do is something better suited for motion graphics software like Vegas Post or After Effects. Vegas is a NLE, so its ability to generate graphics is very limited.