for the impatient:
computer1$ pv <yourfilename> | nc -l -p 9812
computer2$ nc computer_1_address 9812 | mplayer -
for the others:
goal: you want to see a video stored on a remote computer, without transferring it locally. also without the fuss of fancy streaming servers and apache mods.
simple solution: fire up the wonderful pv (pipe viewer) in conjunction with netcat on the streaming computer, then, watch the remote video thru mplayer piped with nc. there's a downside: you can't seek back and forward, but you can pause of course!