METHOD AND DEVICE FOR ALLOWING SEAMLESSLY SWITCHING FROM ONE LAYER TO ANOTHER IN A CONDITIONAL ACCESS SYSTEM CONTEXT

摘要

Generating streams of respective layers representative of respective versions with respective bitrates of an audio-visual content, for allowing seamlessly switching from one layer to another in a conditional access system context, comprises: multiplexing segments of said layers, such that segments representative of a same part of the audio-visual content are grouped together; modifying timestamp information in said multiplexed segments, such that said modified timestamp information matches the timestamp information of a single stream; injecting the multiplexed segments with modified timestamp information in a conditional access scrambler; obtaining, from the conditional access scrambler, a scrambled multiplexed stream; extracting from said scrambled multiplexed stream one scrambled stream for each layer; restoring, in each extracted scrambled stream timestamp information, such that said restored timestamp information matches the timestamp information of a single stream.