[mythtv-users] Steaming HDTV Performance.

BRIAN LANG brianlang75 at msn.com
Thu Dec 21 15:23:23 UTC 2006

I'm really impressed with how helpful everyone has been.  Thanks!
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?

> Date: Wed, 20 Dec 2006 21:52:30 -0800> To: mythtv-users at mythtv.org> From: bpreston at collabras.com> Subject: Re: [mythtv-users] Steaming HDTV Performance.> > By definition, a full 1080i HD signal will absorb 19.2 Mbps of ethernet > bandwidth (actual results may vary ;). Most consumer grade Network Cards and> > Switch hardware will forward approximately 60% of bandwidth if there is > minimal node contention creating collisions. Depending upon the nature of > other traffic on your network, you should easily get two frontends to> operate ( I do ) on a 100 Mbps ethernet backbone. > > If you have or plan to have network based gaming, security monitoring,> network cameras or home automation on the net as well, you may find yourself> stressed (I do in some situations) and want to go to a 1000 Mbps backbone or> a more creative segmented or vlan'd network design (which was my solution).> > > Brad DerManouelian <myth at dermanouelian.com> wrote: > >> >On Dec 20, 2006, at 9:02 PM, Brad Fuller wrote:> >> >> Brad DerManouelian wrote:> >>> On Dec 20, 2006, at 6:50 PM, BRIAN LANG wrote:> >>>> >>>> >>>> I'm considering building a MythTV system. I'm a software engineer,> >>>> so I don't think I'd have any technical problems that I couldn't> >>>> figure out. I'm weighing the pros and cons of HD Tivo, WIndows> >>>> Vista Media Center, and MythTV. If I do build a MythTV system I'd> >>>> likely have a backend in the basement and two font ends. Both TVs> >>>> would be HD (at least eventually). My concern is the bandwidth.> >>>> Am I really going to be able to stream HDTV shows at a reasonable> >>>> rate? What kind of performance can I expect? All 3 computers would> >>>> be fairly decent machine and have gigabit ethernet. Thanks!> >>>>> >>>> >>> Lots of people use the HDHomeRun to capture 2 HDTV streams over> >>> 100Base-T, so it is at least able to do that. If you're going to be> >>> streaming more than a couple at a time, you should definitely> >>> consider gigabit (You should consider it anyway since the hardware is> >>> reasonably priced now.)> >>>> >> The capturing of ATSC is not really a cpu intensive operation using > >> PCI> >> cards (like the pcHDTV3000.) There's no encoding going on. Playing > >> 2 HD> >> streams is more intensive, but since you are going to have a > >> backend and> >> 2 frontends, you won't have much problems considering the use of> >> moderately new CPUs and especially if you use Nvidia video cards and> >> work out the XvMC kinks in your specific setup.> >> >He's asking specifically about network bandwidth. The HDHomeRun sends > >two simultaneous HD streams over 100BaseT.> >_______________________________________________> >mythtv-users mailing list> >mythtv-users at mythtv.org> >http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users> >> >> > > _______________________________________________> mythtv-users mailing list> mythtv-users at mythtv.org> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
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