一些常见网络电视的网络或技术是什么？

dyte200

peercast用的是Gnutella网络或技术，其它如sopcast,pplive,streamlive等用的是什么？

Thruth

统称P2P
但是具体实现他们自己并不公开

sejishikong

很多是基于bt协议重新开发的。

dyte200

第一代p2p网络：Napster ，很像集中式网络。用于music传播。
第二代：Gnutella ，完全的分布式网络，优点：不容易遭破坏，缺点很多：发送的ping pong相应信号有可能超过实际数据信号。连接速度慢，网络退化成孤岛...
第三代:Fasttrack ，FreeFT，混合网络。最流行的网络。

dyte200

bt和电驴的协议有什么区别？（知道了）
eDonkey was created first... and offered some significant improvements over the 1st and 2nd generation P2P clients discussed in the history. For one, eDonkey provided the ability to download one file simultaneously from multiple sources.

A special advantage of eDonkey, however, is that users start sharing a file as soon as they start receiving it. This means, if you are 200megs into a 400meg download, the 1st 200megs will already be made available to other users (from you) to begin their downloads. This means everyone that downloads also uploads. The end result is faster propogation of files and faster speeds on more popular files. This makes this network very popular for large files.
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Bit-Torrent is a unique file distribution system. It is not quite like a traditional Peer-to-peer system. This system is good at distributing large files to the masses.

The way the system works is one user must host the source file. A special "BitTorrent" link is then generated. Other users may start downloading from the original source. The cool feature is that each user is downloading a different part of the file. Shortly afterwards, they start downloading the parts they don't have from each other. The file transfer is therefore spread and distributed over the total number of people downloading the file. This means everyone who is downloading is also uploading.

This same system is implemented in the eDonkey/Overnet P2P network which is what makes it so efficient at distributing large files.

BitTorrent, however, is not a general purpose P2P network. Instead, it is useful to download that one large file... the problem is you need to find someone hosting that file.

While there are a few other clients which support the BitTorrent network, the official client does a reasonable job.

      Advantages: good for large files
      Disadvantages: not organized as a network, need to find links yourself

一篇讲述skype协议的文章：
http://www.cs.columbia.edu/~libr ... 004/cucs-039-04.pdf

dyte200

各种网络电视评测：
http://family.chinaok.com/2005-12/15338_8.htm