Hello everyone!
Today I'm glad to present to you my first library: NitroFS Video Player Lib.
This library allows you to play video (with no sound) from Nitro FileSystem. It also comes with a tool that allows you to convert videos to the *.EMC...
The nitroFS code doesn't recognize being launched from the DSi Menu.
You could try this nitroFS implementation here, but it only works with hiyaCFW: https://github.com/RocketRobz/SuperPhotoStudio/blob/master/nds/arm9/source/utils/nitrofs.c