[mythtv-users] Playback issues with myth frontend over a wireless network

Minh Duong minh_duong at yahoo.com
Sat Dec 15 18:02:12 UTC 2007


--- Brion Swanson <brions at usalug.net> wrote:

> On Sat, 2007-12-15 at 08:15 -0500, Charles H.
> Chapman wrote:
> > Brion Swanson wrote:
> > > For a while I was running my Myth frontend with
> a Linksys Wireless G card
> > > and it was ok for SD.  I didn't have any HD
> content, but the maximum data
> > > transfer rate of wireless G is only about 6.75
> MB per second so HD will be
> > > hit and miss most likely (depending on packet
> loss) and you're likely to
> > > only be able to support a single stream at a
> time.
> > 
> > Argh!  Where do you people get these numbers?!?!?!
>  You must be in 
> > wireless B mode without realizing it.  I easily
> get data rates of 20 MB 
> > or more (as MEASURED by tools like Wireshark)
> which is more than enough 
> > to do HD content.
> > 
> Allow me to assist you:
> http://www.google.com/search?hl=en&q=54+megabits
> +in+megabytes&btnG=Google+Search
> 
> Wireless g has a transfer rate maximum of 54
> megaBITS per second.  If
> you convert that into megaBYTES per second you get
> 6.75 (8 bits per
> byte).  Therefore the maximum transfer rate you can
> possibly get with
> wireless g (not including technologies such as
> Linksys SpeedBoost which
> combines multiple wireless g channels to get faster
> rates) is 6.75 MB/s.
> If you're getting 20 MB/s transfer rate over
> wireless, then you're using
> something other than a single wireless g connection
> (wireless n or
> SpeedBoost).
> 
> Please correct me (and Google) if my math/conversion
> is wrong.  In my
> experience, a 100 mbps ethernet connection can
> sustain about 13 MB/s
> which is why I'm boosting my network to gigabit
> ethernet very soon in
> order to support multiple HD streams across the
> network simultaneously.
> 
> Brion
> 

I think this is the reason that wireless networks
generally are not recommended for a mythTV frontend. 
There are too many factors affecting their performance
and you will need wireless to be in peak performance
to get the transfer rates you'll need for a seamless picture.


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