[mythtv-users] Steaming HDTV Performance.

Blair Preston bpreston at collabras.com
Thu Dec 21 05:52:30 UTC 2006

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.
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