Media streaming with adaptation

摘要

A method and apparatus for receiving a media stream provided in a plurality of different, alternative encoded representations. Each representation comprises a series of discrete fragments and each fragment comprises a contiguous temporal segment of the stream. The method comprises: obtaining (240, 310) at least a part of a first fragment from a first one of the representations; obtaining (210, 320) at least a part of a second fragment from a second one of the representations, wherein the first and second fragments comprise temporal segments that overlap at least partially; decoding (250, 330) a first temporal segment of the media stream from the first fragment; and decoding (260, 350) a second, later temporal segment of the media stream from the second fragment. In this way, the method switches from receiving the stream in the first representation to receiving it in the second representation.

主权项

1. A method of receiving a media stream provided in a plurality of different, alternative encoded representations,
each representation comprising a series of discrete fragments over time intervals, the method comprising, when switching from a first representation having a first data-rate to a second representation having a second data-rate: obtaining at least a part of a first fragment from the first representation; obtaining at least a part of a second fragment from the second representation, wherein the first and second fragments are in time intervals that overlap at least partially; decoding the at least part of the first fragment; creating a synthetic frame for the second representation by re-encoding the last frame decoded from the at least part of the first fragment using encoder settings corresponding to the encoding of the second representation; and decoding the at least part of the second fragment using the synthetic frame as a reference frame for initializing decoding of the at least part of the second fragment, thereby switching from receiving the stream in the first representation to receiving it in the second representation.