Also this (or variants thereof, like piping to ffplay instead): $ ssh remotehost.example -- 'ffmpeg -i /dev/video0 -f webm -' | mplayer -
Easy, secure streaming of remote computer's webcam. If you're running a relatively new version of #ffmpeg you might want to add -c:v libvpx (because it otherwise encodes with the currently-awfully-slow vp9 codec).