Player
Obective: fork "videopress" to support non-flash content and playback, maybe also podcasts and torrents for big files…
Best way right now seems to get source hosting elsewhere, as the offical sources were not update in last 8 months…
This seems like a nice player to build on: http://videojs.com/.
Converter:
The Miro Converter has a nice ffmpeg command list on their wiki: https://develop.participatoryculture.org/trac/democracy/wiki/ConversionMatrix