Many video sites prevent their content from being viewed, streamed, or downloaded unless you are in their country. A common way to around such restrictions is to find a proxy server in the appropriate country. However, many video websites can bypass your proxy server through the use of Adobe Flash, Adobe AIR, RealPlayer, or Microsoft Silverlight to stream the video.
If you're having this problem, the free FoxyProxy Video Utility can help.
Code:
http://foxyproxy.mozdev.org/proxyservice/video-and-audio.html