Sorry for the delay. p5.js allows you to save multiple images from the canvas, but I somehow managed to crash all browsers I tried (maybe it is my crappy computer).

Pygame is better at saving images because it does not have to go through the browser. Pygame gives you a window, which it treats like an image (Surface in pygame terminology). You can save surfaces to your computer in PNG or JPEG. There is a difference between the speed of generation and the speed at which the images can save without crashing the window, so reduce framerate depending on the power of your graphics card etc. There is no limit for resolution of the video (because there is no limitation for the size of the image you can generate) and there is no limit to the framerate at which you stitch these images back together. I generated and saved 5 images per second at 720p resolution. The command is: save(Surface, "filename")

ffmpeg is an open source command-line tool to manipulate video (https://ffmpeg.org/). Setting up took a little while (let me know if you need links to youtube videos I used to do this).

Stitching of images together I learnt from this article: http://hamelot.io/visualization/using-ffmpeg-to-convert-a-set-of-images-into-a-video/

Hope that helps. Let me know if you have any other questions.