[Klug-general] HDMI over wifi ... ?

[Paul Lawrence]

Thanks Karl .. will let you know how we get on .. defo much more than 15m.
 
Paul


________________________________
 From: Karl Buckland <buckland.karl at gmail.com>
To: Paul Lawrence <paul.z.lawrence at btinternet.com>; Kent Linux User Group - General Topics <kent at mailman.lug.org.uk> 
Sent: Sunday, 18 January 2015, 15:15
Subject: Re: [Klug-general] HDMI over wifi ... ?
 


I've looked into this previously, as I want to run HDMI from one room to another inside my home. 

Unfortunately there is no such thing as true wireless HDMI. As Roger Gammans has noted, the bandwidth requirements are simply too high. Even to run HDMI over cat5 cable (not a network, but simply the cable) requires two cat5 cables of good quality. Even then, I've found that depending on the length of the run, 1080p may not be an option. In my case a 20m run of cat5 cables allows 720p but not 1080p. 

There are products out there that claim to enable wireless HDMI. What they actually do, is convert and compress the HDMI signal and then send it over TCP/IP or using another proprietary method. Whether or not this is an acceptable solution for you depends on your requirements. I want to play movies over the HDMI connection, so ideally I want a good clear uncompressed signal. If you do go with the wireless route, then the quality of the resulting picture (and audio) depends on signal strength, so if you have a lot of other wireless signals in the sane frequency range then that will cause you problems. I also expect that if you need to go through a thick church wall, then that might present an issue?

From what I can see the best results actually come from high quality HDMI cables (such as those made by BlueRigger), but even there most cables have problems when they get near the 50m mark. If you need to run anywhere near that length, then all bets are off, and you'll need to experiment. Also, before anyone chimes in about 'expensive HDMI cables' - yes it's true that over short runs (less than a couple of metres) even the cheapest HDMI cable will be absolutely fine. Over longer runs that simply isn't the case. Even the smallest signal degradation will bring HDMI to its knees. The higher quality long-run cables have thicker wires to prevent that signal degradation over such a distance. You can also find some cables with 'boosters' in them (or buy separate powered boosters separately). I haven't tried these boosters, So I can't vouch for their effectiveness. My own setup is now a 15m BlueRigger HDMI cable, which can do 1080p with no issues.

Hopefully this is helpful for you.

Karl



On 18 January 2015 at 12:22, Paul Lawrence <paul.z.lawrence at btinternet.com> wrote:

Hi
Group
>
>
>Some
advice please.
>
>
>I've
been working with a group to install a giant TV in my
localchurch (12thCentury and therefore the structure is highly regulated) for
presentations/videos etc and using maybe Easyworship software to manage the displays. The
TV is lowered and raised from the roof area as required (which
required lots of permissions)The arrangement is based
on agraphics card in the PC that has
HDMI out. Distance from PC to TV must be at about 50mwhich we manage using a pair of
HDMI over Cat5 boxes. This works pretty well.
>
>
>Fig1:
>
>
>PC&HDMI
→ Convert to Ethernet → 2xCat5 → Convert to HDMI → TV
>I
>line-out
>I  
>V
>sound-desk
>
>
>Enables
us to play the presentation on TV and manage the sound via existing
sound-desk and sound system.
>
>
>The
Cat5 is proving unreliable (and very untidy) and we've looking at
ways of using wifi (and currently an AppleTV box) to replicate the
above.
>
>
>Fig
2:
>
>
>iMAC/PC
→ wifi → Airport → wifi → Apple TV → TV
>
>
>We
can use Airport router and Airparrot2 software to send to an Apple TV
box plugged into the TV HDMI to display the video but no sound comes
from the PC - all sound is from the TV. An alternative could be a
Chrome browser to 'cast' the tab to a Chrome dongle but I suspect the
same result.  
>
>
>
>
>1.
Am I right in thinking that when using Airparrot2/Chrome browser the
PC has no action in decoding the file merely streaming to the TV? And
that is why we get no sound from PC. Which leads me to think we'll
need to connect the TV to the sound desk via one of the sound input
XLR points.
>
>
>2.
If we cannot repair/re-run the Cat5 .. is there a (cheap) way of
sending HDMI over wifi?
>
>
>
>
>Thanks
>
> 
>Paul
>_______________________________________________
>Kent mailing list
>Kent at mailman.lug.org.uk
>https://mailman.lug.org.uk/mailman/listinfo/kent
>
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