| 摘要 |
A system and method uses a closed captioning script to synchronize supplemental data with specified junctures in a video program. A parser parses the closed captioning script to identify a set of unique key phrases. A producer associates the supplemental data with the key phrases of the closed captioning script that correspond to the desired points in the program. When the program is played, a viewer computing unit monitors the closed captioning script to detect the key phrases. Upon detection of a particular key phrase, the viewer computing unit retrieves the supplemental data associated with the particular key phrase. The supplemental data is multicast to a multicast address. A listener listens to the multicast address to receive and handle any enhancement action supported by the supplemental data. The listener can be embedded in a container, such as an HTML page or other hypermedia document. |
