Our Flash video is delivered using Brightcove, and you can see the systems requirements on their website: Brightcove standards
Other video we deliver using Windows Media Player, often with Digital Rights Management attached, for example, the Channel 4 Live Online simulcast service, Catch-Up on Channel4.com, 4oD and some other video content.
For this video to play correctly, this is what you need:
Windows XP, Windows Vista
Internet Explorer 5.5 or 6
Windows Media Player 10
Cookies enabled (Internet Explorer security settings set to medium) A high speed internet connection capable of streaming at a minimum of 512kps