| 摘要 |
Temporal metadata associated with media content drives bilateral interaction between a media server and an IPTV control server during streaming of that content from the media server. Specifically, the metadata is encoded to indicate, and associate together, a defined point in the media content's presentation timeline and a defined operation, such as the fetching of supplemental media content or the sending of a notification. The media server inspects this metadata and, based on that inspection, notifies the IPTV control server when the defined point has been reached in the context of streaming the media content. Responsive to receiving this notification, the IPTV control server inspects the metadata to identify the operation associated with the notified point in the content's timeline. The IPTV control server then initiates the performance of the identified operation and returns a response to the media server that pertains to such performance.
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