A similar example albeit an order of magnitude smaller: I work with a space instrument which includes a camera, and for various purposes some times we need to s

A similar example albeit an order of magnitude smaller: I work with a space instrument which includes a camera, and for various purposes some times we need to send down entire images. Due to the of course limited bandwidth, there is an option to compress the image to a jpeg and send it down. The jpeg compression is written from scratch. Of course much simpler than ffmpeg and video encoding, but reinventing the wheel is not at all uncommon in aerospace (and curiously enough, reinventing the wheel is precisely what the entire sector is trying to avoid..)