URI: myth://host:port/filename

or, when downloading LiveTV content...

URI: myth://user:password@host:port/?dbname&channel=channel_num

sample (remote .NUV file): gnomevfs-cat myth://127.0.0.1:7654/video.nuv

sample (LiveTV): gnomevfs-cat 'myth://mythtv:mythtv@192.168.3.165:6543/?mythconverg&channel=4'