better video rendering in d

[monkyyy via Digitalmars-d-learn]

My current method of making videos of using raylib to generate 
screenshots, throwing those screenshots into a folder and calling 
a magic ffmpeg command is ... slow.

Does anyone have a demo or a project that does something smarter 
(or willing to do the busy work of finding the right combo of 
dependencies that just work)

I require basic images, text, and transparent rectangles

https://youtu.be/HxFSmDNvDUI

ideally raylib or image magik for the frame generation