GBA video uses MJPEG/Mpeg (called Meteo) at 240x160 so its just smaller version of what the 3DS is playing in its camera/video cia converterWell, these gba video roms use some strange video codec again. I've been looking in it for a bit, but it would take a lot of work again to reverse it. And the quality is crap.
Soon I'll release my moflex encoder, which will make it possible convert videos to moflex and inject them into cias that play moflex files.
The gba video paks by Majesco use their own proprietary codec, based on vector quantization.GBA video uses MJPEG/Mpeg (called Meteo) at 240x160 so its just smaller version of what the 3DS is playing in its camera/video cia converter
that and its up to 15 fps tops is why its space is so small also