This link should work for those who do not get to watch the 49ers/Cowboys live on TV. This online link should show the game live. I tested other channels on their main site (Saints/Raiders) and that game was airing. So it should be good to go.
http://www.atdhe.net/8660/watch-san-francisco-49ers-vs-dallas-cowboys if that doesn’t work this one should http://www.justin.tv/vandelay_kramerica