(This message is obsolete... it talks about the first, very limited version that i released)
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right after you install it, nothing immediately is any different.. you need to manually assign the mime types in the /usr/share/applications/defaults.list to hildon-dbus-switchboard.desktop

It is python though, so hardcoded means you could edit the python (text) file in /usr/bin/dbus-switchboard.py to pick any other media player that accepts command line parameters.

Does canola accept command-line parameters? I thought it just used mplayer or media player engine to run video.

Eventually it would be nice to have a separate python program to edit these associations and save config to file... and then make dbus-switchboard read from that configuration file... then you could switch out the associated app on the fly without editing (as root) the python file. I'm not too advanced making python programs so any help would be appreciated.