| 摘要 |
The invention provides a secondary stream (20) of rich media packets (21, 22, 23) defining scene states of a sub-portion (34) of a scene (30) representable by a primary stream (10) or rich media packets (11, 12, 13). Local random access data defining instructions for enabling creation, when being processed, of a starting state of the scene sub-portion (34) without affecting the scene state of scene portions (32, 36) is provided. The local random access data is packed into at least one rich media packet (21, 23), which is inserted into the secondary stream (20) and transmitted to at least one user terminal (300). The local random access data can be used by terminals (300) for tuning-in to the secondary stream (20) and/ or for error recovery relating to the secondary stream (20). |
