Comfort Home Automation/ Security System Forums Home
 Search       Members   Calendar   Help   Home 
Search by username
Not logged in - Login | Register 

HDMI marches onward
 Moderated by: admin  
 New Topic   Reply   Print 
AuthorPost
Muttley
Comfort Installers


Joined: Wednesday May 28th, 2008
Location: Scottish Borders, United Kingdom
Posts: 6
Status:  Offline
 Posted: Thursday May 29th, 2008 08:47 am
 Quote  Reply 
Not Comfort related but of general interest to most of us

Sky have withdrawn their component high definition (YPbPr) outputs from all new HD boxes supplied in the UK even going as far as to remove stock of these older boxes from their suppliers warehouses and replacing their stock with the newer boxes. Leaving HDMI as the only HD output availible :X  (though I have heard a rumour that there is a component HD output availible from one of the SCART sockets but whether this is a true HD component output i.e. YPbPr or simply SD RGB (576i) is unkown - maybe someone can enlighten me)

We witnessed this at first hand on an installation we were on this week. We had planned for component HD distribution from the rack to the main TV via MediaX (aka CAT8) using a single cable (we can get the HD signal and the optical digital audio signals down 4 pairs of CAT8). A distance of about 30M. The Sky installation agent turned up with one of these new boxes just a WEEK after they had been informed that component HD was being withdrawn after a bit of "negotiating" on behalf of the client a single HD box with component video output was found lurking in their stock room and installed instead.

They had called their distributor/wholesaler to order a buffer stock of the older (& better) boxes in only to find that the wholesalers stock had been replaced lock, stock and barrel with the new boxes 3 days before (apparently over 300 units!) and the old style boxes removed from sale.

One wonders what sort of gun the HDMI association/industry has held to Sky's head to explain this sort of response.

For those of you who aren't aware there are two main issues with HDMI

1) it has a very limited transmission distance, if you want to go beyond 15M then you have to start looking at utilising some form of balun/extender which are expensive. Component HD isn't realy limited to the distance it can be transmitted in practical terms (we nominally say 100M on CAT8 but this could apply to RGB co-ax as well) and in my humble opinion Component HD gave a better quality picture that was noticable of large screens (50"+) and projectors.

2)HDMI extenders require x2 twisted pair cables (CAT5e, 6, 7, 8) hence it is very resource hungry.

Not an issue for those who still prefer the set top box next to the display but on rack mount distributed installations its a pain in the @rse :(

Cheers

Gavin

Intelligent Buildings Ltd.

 

 

 

garym999
Comfort Installers


Joined: Saturday Aug 19th, 2006
Location: United Kingdom
Posts: 189
Status:  Offline
 Posted: Saturday Jun 7th, 2008 09:44 am
 Quote  Reply 
Hmm, I tend to aggree my experiences using HDMI also have me wondering about the quality. With my personal system I run an external scaler and I get a better picture using VGA or DVI as I can get 1 for 1 pixel matching where HDMI requires the TV to scale.

A quick google found this http://www2.dvigear.com/codvitohd.html. Not cheap but might do the job, does not support HDCP though. Why does the industry keep shooting themselves in the foot? I'm sure there is other kit out there. Ebay?


 Current time is 03:49 pm




Powered by WowBB 1.7 - Copyright © 2003-2006 Aycan Gulez
We insist that you abide by the rules and policies stated below. Although the moderators of the Comfort Forums will attempt to keep all objectionable messages off this forum, it is not possible for us to filter all messages. All messages express the views of the author. Cytech Technology is not responsible for the content, views or advice of any message posted by members, including staff of Cytech. By registering for the forums, you warrant that you will not post any messages that are obscene, vulgar, of a sexual nature, abusive, hateful, threatening, of racist nature or otherwise in breach of any laws. Cytech reserves the right to remove, edit or move message or topic for any reason