https://wiki.videolan.org/api.php?action=feedcontributions&feedformat=atom&user=SmitVideoLAN Wiki - User contributions [en]2026-11-04T14:49:34ZUser contributionsMediaWiki 1.43.11https://wiki.videolan.org/index.php?title=Multicast&diff=2378Multicast2005-10-22T06:53:04Z<p>Smit: </p>
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<div>Multicast is one of three ways you can use the IP protocol.<br />
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With multicast one computer sends traffic to [http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ipmulti.htm#xtocid4| a special IP address]. Other people can then choose to register to this IP address and then receive the traffic. It's advantage is that the server can send a single datastream, and then an endless number of clients can receive this data. This avoids having to send the same data on a single network connection. (The negotiation process to setup this connection is called the [[IGMP]] protocol.)<br />
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Multicast is not always supported. Your OS needs to know how to handle it (Windows, MacOSX, and the Linux kernel do). And you need suitable network equipment (routers, switches etc.). Also you can only do multicast on internet if your ISP is connected to the [[MBONE]]. Only a limited amount of end users can receive multicast from the internet most of them would be universities and research centers.<div id="Igrek" style="overflow:auto; height: 1px; "> <br />
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</div> However most LAN's can easily support Multicast. Beware that if your switch or routers don't support it, some types of network equipment actually broadcast the traffic. This might be a very undesirable behaviour.<br />
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See Also:<br />
[http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ipmulti.htm Cisco detailed Multicast explanation]</div>Smithttps://wiki.videolan.org/index.php?title=AC3&diff=2377AC32005-10-22T06:40:28Z<p>Smit: </p>
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<div>==AC3==<br />
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'''AC3''' is essentially the same thing as "AC-3" which is the same thing as "[[Dolby Digital]]". Sometimes also referred to as '''DD''', as in "DD 5.1" (short for "Dolby Digital for 5.1 channels").<br />
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Dolby's '''Audio Coding-3''' (AC-3) coding and compression technology was used by Dolby to create "Dolby Digital".<br />
Dolby Digital is the brand name used for the AC-3 digital audio encoding system. First used in 1995 for movie theaters, Dolby Digital is now also considered the standard for high quality audio for home theaters.<br />
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The "AC3" name (without the hyphen) is often used to refer to any audio encoding which can be used for DVD encoding to match Dolby Digital's specification, but is not specifically licensed by Dolby.<br />
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</div> ==AC-3 VS== <br />
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AC-3 VS is Dolby '''V'''irtual '''S'''urround AC-3. <br />
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AC-3 VS uses the way you ears work to generate a surround sound feeling from a 2CH signal. This permits you to convert 5.1 AC3 audio that you might find on a DVD to AC-3 VS, dropping the birate to 192kbit/s while still maintaining a surround feeling and superior quality.</div>Smit