There are lots of options in Quick Time Pro 7 with regards to exporting videos to different formats. There is an MPEG4 option but I'm not sure what the settings are to have the 770 recognize the videos.

Also, it took a while for me to figure out how to switch java settings to v.5 on the Mac.

As for improvements, on the main screen, maybe you can add some note there what kinds of videos/file types it can convert. A destination folder would also be nice, just in case the 770 is connected to the mac directly, and you want the converted video to be generated on the card directly.

Thanks for all your hard work.