Share

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Peercasting is a method of multicasting streams, usually audio and/or video, to the Internet via peer-to-peer technology. It can be used for commercial, independent, and amateur multicasts. Unlike traditional IP Multicast, peercasting can facilitate on-demand content delivery.[1]

Operation[edit]

Peercasting usually works by having peers automatically relay a stream to other peers. The P2P overlay network helps peers find a relay for a specified stream to connect to. This method suffers from poor quality of service during times when relays disconnect or peers need to switch to a different relay, referred to as "churn".[2]

Another solution used is minute swarming, wherein a live stream is broken up into minute length files that are swarmed via P2P software such as BitTorrent, Coral, or Dijjer. However, this suffers from excessive overhead for the formation of a new swarm every minute.

A new technique is to stripe a live stream into multiple substreams, akin to RAID striping. Forward error correction and timing information is applied to these substreams such that the original stream can be reformed using at least all but one of the substreams (fountain codes are an efficient way to make and combine the substreams). In turn, these streams are relayed using the first method.

Another solution is to permit clients to connect to a new relay and resume streaming from where they left off by their old relay. Relays would retain a back buffer to permit clients to resume streaming from anywhere within the range of said buffer. This would essentially be an extension to the Icecast protocol.

Software used for peercasting[edit]

Free and open source software[edit]

Proprietary[edit]

See also[edit]

References[edit]

  1. ^ Buford, John F.; Yu, Heather; Lua, Eng Keong (2008). P2P Networking and Applications. Morgan Kaufmann. p. 203. ISBN 0-12-374214-5. 
  2. ^ Garbinato, Benoît; Miranda, Hugo; Rodrigues, Luís (2009). Middleware for Network Eccentric and Mobile Applications (1st ed.). Springer. ISBN 3-540-89706-2. 

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license