More information is needed. Local file or from a plugin? Hulu? A third party plugin?
Hulu's videos do expire over time for certain shows. Can you play this video off the hulu site?
Another plugin? Most of the third party xbmc plugins that grab "no so legal" tv shows off the net are hit an miss. These are not officially supported and more often then not you'll see videos don't play correctly, don't play at all or are of poor quality. This is out of the dev's hands.
r&d, apps, api