Yes, all this movies played well in iTunes before the conversion.
There are some from a Apple´s podcast:
http://www.apple.com/podcasts/quicktips/apple-quick-tip-of-the-week.xml
This podcasts are MPEG-4 Video File and work perfectly with iTunes, but they are scanned by Firefly. After I convert them to Quicktime Video File with quicktime (export as mpeg-4, video setting: Pass Throught, audio setting: Pass Throught) they were scanned by Firefly (both in Windows and Debian systems)
There´s some others videos that I made with HandBrake, but they are too huge to post a link to them.
Finaly, I have to say that Firefly is working perfectly in Debian throught a wireless network. As a sugestion, I think that could be good to limit in the Web GUI the number of users that could access the Firefly playlists or play the musics and videos.