Although iTunes 6.0 doesn't enable proper, seamless video sharing, you can use it as a means of publicising available video streams on your LAN, and clients can use iTunes to view those streams, albeit in a limited way.
- Install Darwin Streaming Server. A complete how-to is beyond the scope of this hint.
- Open your desired video in QuickTime Pro.
- Export the Movie to the streaming server's shared location (/Library -> QuickTimeStreaming -> Movies by default). You can re-encode if you like, but provided your LAN is fast enough, you should be able to get by with merely hinting the files. Try the following settings:
- Export: Movie to Movie or Movie to MPEG-4. Select Options...
- Video/Video format: Pass through
- Audio/Audio format: Pass through
- Streaming: Enable streaming and Optimize for server
- Add a streaming audio/radio URL to iTunes. Select Advanced: Open Stream..., and paste in your favorite web-radio URL. Here's one to try: http://www.radiokeneally.com/listen/RadioKeneally.pls
- Copy that new iTunes Library item to the video playlist you plan on sharing.
- Choose File: Get Info on the radio stream, and modify the URL to reflect the streaming server location. Often it will be of the form rtsp://servername.local/Filename.mp4. You can also change the metadata fields to describe the video.
- Repeat steps two to six for the other videos.
- Connect using iTunes. The videos will play in the Album Artwork pane only.
Okay, perhaps the reward is too meager for the effort, but there is absolutely nothing intrinsic to iTunes that prevents video sharing, as you can see.