METHODS AND APPARATUS FOR COMMUNICATING DELAY INFORMATION AND MINIMIZING DELAYS

摘要

Features relating to communicating delay information and minimizing aggregate processing delays corresponding to content streams, e.g., audio and video streams, in a multi-media communication session while still achieving stream synchronization, are described. Some embodiments are well suited for systems where video and audio streams are transcoded by different entities. In some embodiments downstream entities, e.g., transcoder and/or receiving end device, are informed about the delay introduced to at least one stream by one or more upstream devices, e.g., a transcoder. The downstream entity synchronizes the received content streams by adding artificial latency as needed to the relevant one of the streams based on the received delay information thereby avoiding unnecessary introduction of artificial delays at every transcoding node in the path. Received delay information for a content stream may indicate one or more individual transcoding delays introduced into the stream or an aggregate of transcoding delays introduced into the stream.

主权项

1. A method of operating a device, the method comprising:
receiving a first content stream which was subject to transcoding prior to receipt; receiving a second content stream; determining a stream delay difference between said first content stream and said second content stream; and delaying the second content stream by the amount of the determined stream delay difference.