| CPC H04N 21/4621 (2013.01) [H04N 21/2187 (2013.01); H04N 21/44008 (2013.01); H04N 21/440263 (2013.01); H04N 21/44209 (2013.01)] | 20 Claims |
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1. A method, comprising:
requesting a manifest file corresponding to a media presentation of a live event;
receiving the manifest file, wherein the manifest file comprises information identifying a set of video fragments for each segment of the media presentation, each set of the video fragments comprising different bitrate versions of the corresponding segment of the media presentation;
requesting a first video fragment for a first segment of the media presentation at a first bitrate;
receiving the first video fragment in a buffer;
determining a plurality of bitrate paths in a window of sequential segments of the media presentation starting with the first segment, wherein each bitrate path of the plurality of bitrate paths is a monotonic trajectory of bitrates for segments in the window;
determining a quality of experience (QoE) score for each bitrate path of the plurality of bitrate paths, wherein the QoE score for a bitrate path is determined from:
a utility of the bitrate path based on the bitrates for each segment in the bitrate path,
a rebuffering cost of the bitrate path based on a buffer level of the buffer after downloading segments in the bitrate path and the bitrate of segments in the bitrate path, and
a bitrate switching cost based on the bitrates of sequential segments in the bitrate path;
identifying the bitrate path of the plurality of bitrate paths having the highest QoE; and
requesting a second video fragment at a second bitrate along the identified bitrate path for a second segment of the media presentation sequential to the first segment.
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