This adds a way to convert demos into mp4 (h.264) videos using ffmpeg-libraries. This feature is optional and defaults to off. It can be included by setting ffmpeg.value = true in config.lua.
Demos...
@Holi i compiled it for windows quite some time ago maybe i can find it otherwise you could also compile it on your own as the others already suggested but note that it is not entirely finished and only records the video but no sound