[grishka]

Relatedly, I recently made a software decoder for SECAM and PAL: https://github.com/grishka/miscellaneous/tree/master/AVDecod...

Though in my case the purpose was to digitize my video tapes and teach myself about DSP.

[throwaway2046]

Looks interesting... Is there an equivalent encoder that can be used with this to generate VHS footage purely in software?

[grishka]

There's this: https://codeberg.org/fsphil/hacktv

It's not "VHS footage" though, but it can generate all kinds of analog video signals, some of which my decoder can decode.