Here is Castnow, a command line utility for Chromecast geeks!
Castnow is a command line utility that’ll stream videos, music, and even torrent files. Castnow works independently of Chrome and entirely from the command line. You can set it so it plays a single local video file, an entire directory, a web video file, YouTube clips, a YouTube playlist, a torrent file with a magnet link, and even do transcoding.
Torrent casting may be little clunky and slow, but remember that you are getting to do this without Chrome.