No autoformat please

I am trying to use a simple method to post video’s using a plugin which allows me to code like this:
[video]http://video.google.com/videoplay?docid=6805063692754011230[/video]

But somehow when I post this using the tinyMCE-editor extra code is automatically added:
[code][video]http://video.google.com/videoplay?docid=6805063692754011230[/video][/code]

What would be the easiest trick to disable this auto-format without disabling the tinyMCE-editor? I don’t want the end-user to add the link using the html-box. Again; it should be userfriendly. Posting just a link like this one [video]http://video.google.com/videoplay?docid=6805063692754011230[/video] is all I need.

Thanks in advance for help and suggestions!