Starting in version 3.5, Miro supports video conversions. This requires ffmpeg and, for conversion to Theora, ffmpeg2theora. Unfortunately these cannot be shipped in the main Fedora repositories due to patent issues, but if you live in a legal jurisdiction where software patents are not valid, feel free to enable a third-party repository and install the missing components as such: # yum install ffmpeg ffmpeg2theora Note that binary distributions of ffmpeg often are not compiled with libfaac support, due to licensing issues, so you might not be able to generate MP4 files. Conversion to Ogg Theora/Vorbis and MP3 should work fine. For more details, see: http://www.getmiro.com/userguide/troubleshooting.html