I used MKVToolNix GUI and Meteo avi2gba v1.4 (Eng translation) to make it. LOTS of trial and error bullshit went into making this, but I got the video settings set to the max of 500KB/s and the entire thing is under 3MB of ROM space. Check out the link below for more info!
The project is hosted here: https://jayrojones.itch.io/jayros-gba-video-test-cartridge
View attachment 259996
The project is hosted here: https://jayrojones.itch.io/jayros-gba-video-test-cartridge
View attachment 259996