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Re:Bringing Peer-to-Peer Streaming to the World. by nitrogen on Thursday February 27, 2014 @08:31PM (#7316671)
Things like transcoding for different sizes / mobile as well as DVR style seeking/recording.

Ogg Vorbis was designed with bitrate shedding in mind (drop bits from packets to get a lower bitrate), though I'm not aware of it being used. Are there any bitrate shedding video codecs? If not, one could be developed that allows low-bandwidth clients to request only a percentage of the blocks of a stream and decode a low-resolution/low-quality image therefrom.

Re:Bringing Peer-to-Peer Streaming to the World. by wmf on Thursday February 27, 2014 @08:36PM (#7316692)
There's Scalable Video Coding.