| 摘要 |
A method for data communications includes conveying from a server to a client a virtual index file, which identifies multiple sequences of media files available for download to the client, including a plurality of the sequences that contain a given item of streaming content for download to the client at a different, respective data rate for each sequence. A selection is received from the client of a sequence among the plurality of the sequences of the media files. Responsively to the selection, the media files in the sequence are created at the respective data rate and are downloaded to the client.
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