Distributing Graphic Content Over a Public Network for Inclusion in a Linear Television Broadcast

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for receiving and distributing user-generated video content. In one aspect, a method includes receiving, via a network from a remote web server, a web page defining graphics data for presentation in a linear television broadcast. The received graphics data includes data defining one or more transparent regions. The method further includes compositing the received graphics data, based on the one or more transparent regions, with video from at least one other channel using a video switcher to form a composite video image, and transmitting the composite video image for distribution in a linear television broadcast.