<html>
<head>
<style>
P
{
margin:0px;
padding:0px
}
body
{
FONT-SIZE: 10pt;
FONT-FAMILY:Tahoma
}
</style>
</head>
<body>I'm really impressed with how helpful everyone has been. Thanks!<BR>
<BR>
The reason I asked it that currently I have two series 2 Tivos. I'm considering ditching the Tivo world for MythTV when I move to HDTV. When I transfer a recorded show over my wired network between the Tivos the transfer generally occurs at approximately real time (sometimes a little faster, so I can fast forward through commercials sometimes a little slower, so I have pause for the transfer to catch up). Obviously with HD I'm dealing with a lot more data, so my initial thought was that this would be very slow. Is the primary reason I can move so much more data around with MythTV then Tivo due to my TiVos reliance on a USB to ethernet adapter?<BR><BR><BR><BR><BR><BR>
<HR id=stopSpelling>
<BR>
> Date: Wed, 20 Dec 2006 21:52:30 -0800<BR>> To: mythtv-users@mythtv.org<BR>> From: bpreston@collabras.com<BR>> Subject: Re: [mythtv-users] Steaming HDTV Performance.<BR>> <BR>> By definition, a full 1080i HD signal will absorb 19.2 Mbps of ethernet <BR>> bandwidth (actual results may vary ;). Most consumer grade Network Cards and<BR>> <BR>> Switch hardware will forward approximately 60% of bandwidth if there is <BR>> minimal node contention creating collisions. Depending upon the nature of <BR>> other traffic on your network, you should easily get two frontends to<BR>> operate ( I do ) on a 100 Mbps ethernet backbone. <BR>> <BR>> If you have or plan to have network based gaming, security monitoring,<BR>> network cameras or home automation on the net as well, you may find yourself<BR>> stressed (I do in some situations) and want to go to a 1000 Mbps backbone or<BR>> a more creative segmented or vlan'd network design (which was my solution).<BR>> <BR>> <BR>> Brad DerManouelian <myth@dermanouelian.com> wrote: <BR>> ><BR>> >On Dec 20, 2006, at 9:02 PM, Brad Fuller wrote:<BR>> ><BR>> >> Brad DerManouelian wrote:<BR>> >>> On Dec 20, 2006, at 6:50 PM, BRIAN LANG wrote:<BR>> >>><BR>> >>><BR>> >>>> I'm considering building a MythTV system. I'm a software engineer,<BR>> >>>> so I don't think I'd have any technical problems that I couldn't<BR>> >>>> figure out. I'm weighing the pros and cons of HD Tivo, WIndows<BR>> >>>> Vista Media Center, and MythTV. If I do build a MythTV system I'd<BR>> >>>> likely have a backend in the basement and two font ends. Both TVs<BR>> >>>> would be HD (at least eventually). My concern is the bandwidth.<BR>> >>>> Am I really going to be able to stream HDTV shows at a reasonable<BR>> >>>> rate? What kind of performance can I expect? All 3 computers would<BR>> >>>> be fairly decent machine and have gigabit ethernet. Thanks!<BR>> >>>><BR>> >>><BR>> >>> Lots of people use the HDHomeRun to capture 2 HDTV streams over<BR>> >>> 100Base-T, so it is at least able to do that. If you're going to be<BR>> >>> streaming more than a couple at a time, you should definitely<BR>> >>> consider gigabit (You should consider it anyway since the hardware is<BR>> >>> reasonably priced now.)<BR>> >>><BR>> >> The capturing of ATSC is not really a cpu intensive operation using <BR>> >> PCI<BR>> >> cards (like the pcHDTV3000.) There's no encoding going on. Playing <BR>> >> 2 HD<BR>> >> streams is more intensive, but since you are going to have a <BR>> >> backend and<BR>> >> 2 frontends, you won't have much problems considering the use of<BR>> >> moderately new CPUs and especially if you use Nvidia video cards and<BR>> >> work out the XvMC kinks in your specific setup.<BR>> ><BR>> >He's asking specifically about network bandwidth. The HDHomeRun sends <BR>> >two simultaneous HD streams over 100BaseT.<BR>> >_______________________________________________<BR>> >mythtv-users mailing list<BR>> >mythtv-users@mythtv.org<BR>> >http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users<BR>> ><BR>> ><BR>> <BR>> <BR>> _______________________________________________<BR>> mythtv-users mailing list<BR>> mythtv-users@mythtv.org<BR>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users<BR><BR></body>
</html>