Jogged by @pervognsen talking about GBA work, I realise it's 18 years since my brother and I released his Wavelet Video Codec homebrew for the NDS.

DSVideo, you shone bright just before the iPhone domination.

https://www.gamebrew.org/wiki/DSVideo

DSVideo

DSVideo player is a DS Media Player offers a simple and intuitive interface.

GameBrew

There's not much left online about it now, but there's a few snapshots on the wayback machine.

https://web.archive.org/web/20090420151509/http://dsvideo.recoil.org/

Looking back, the Homebrew scene really was a labor of love. Asking your end users to hand-edit a Makefile is hilarious. Still, we had 30k downloads in the first month!

DSVideo, wavelet video on the Nintendo DS