World cup is coming but I cannot see it at home because the time it would be showing is my working hours. So, I am thinking of capturing the TV by my computer at home and turn it into real player or other type of media file. Broacast it, so that I can use my computer in office to watch it.

Is there articles telling how to do it, or any people here know how to make it??
Please help, I have been seraching it for a long time but still could not find any hints.