iMovie export to Ogg Theora? After I finish editing a movie with iMovie '09 under Mac OS X 10.6.4, is there a way to export the final product to Ogg Theora format? OR, is there a way to convert an already exported movie to Ogg Theora easily?
As part of Dive Into HTML5, Mark Pilgrim gives two options:


Encoding Ogg Video With Firefogg
Batch Encoding Ogg Video With ffmpeg2theora


One or both of those should work for you.