ffmpeg's filter system is what you get when you design a meta-language for it. It's also not that bad once you take a bit of time to learn it - it's just a tex

ffmpeg's filter system is what you get when you design a meta-language for it. It's also not that bad once you take a bit of time to learn it - it's just a textual encoding of a graph where each node is a filter with a number of properties.