I like this tool, this could definitely be useful for quickly generating mocap-like animations. It doesn't lag or hiccup what I tested it, and has more UI design put into it than I did with my submission ;)
In the future, I think it could use slightly more advanced options like selecting the type of dithering and scaling, but it is definitely usable as it is now :)
I was also quite surprised how performant Electron was for this purpose! I have to admit I would have imagined video processing needs a more low-level language than TypeScript, but apparently you did find a nice way to make it work. Good job!