| 摘要 |
<p>A delivery arrangement for linear TV programs uses SVC in which encoded enhancement layer video data is pre-downloaded to a STB and encoded base layer video data is live broadcasted to the STB at viewing time Pre-downloading of the enhancement layer data is done during off-peak viewing periods taking advantage of an abundance of network bandwidth while reducing bandwidth demand during peak viewing periods by broadcasting only the base layer data The enhancement layer data is downloaded in a modified MP4 file and stored in the STB for later synchronization and combination with the base layer, which is sent to the STB in a real time protocol (RTP) stream The combined base and enhancement layer data is SVC decoded for presentation to the enduser The pre-downloaded enhancement video file may be provided with digital rights management (DRM) protection, thereby providing conditional access to the enhanced video</p> |
