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237 posts

Master Geek
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Topic # 27075 13-Oct-2008 14:33
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Hey you techos out there – can you help on this one please?!

For a CCTV monitoring desk would like to find about a 26” sized LCD screen with 4

AV in ports (Video In) so can do a split screen showing 4 video cameras.

Have looked but cannot find anything – any suggestions?

Many thanks





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Uber Geek
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  Reply # 170852 13-Oct-2008 14:37
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I've never seen a monitor that does this.

To do this you either have a DVR that does a quad output or feed 4x video signals into a quad processor that will give you 1 output that does this. What type of unit are you using for recording?




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Ultimate Geek
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  Reply # 170856 13-Oct-2008 15:01
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How about have a computer with a few video capture cards in it.. and then you could use a standard screen?? yes?
Might work?? Just an idea



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Master Geek
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  Reply # 170860 13-Oct-2008 15:20
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Just that this photo was in this months NZSecurity mag - http://homepages.ihug.co.nz/~jim.ryan/temp/

The proposed screen will be in a different room (about 10 meters) from the PC based DVR and would prefer to take the camera feeds direct if possible .

Thanks





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  Reply # 170870 13-Oct-2008 16:01
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Those monitors would no doubt be outputs from the DVR unit. I have never seen a display other than very cheap DIY models with built in multiplexers that do this.

It's very bad paractice to do stuff with a signal before it enters the DVR - you introduce points of failure, if somebody turns the TV off for example you will have no picture recorded on any of those 4 channels.
 
Why are you not just taking a feed from the DVR to the monitor? This is normal practice. What sort of DVR unit are you using? Most will have a spot + quad/sequencer output that you can split to multiple screens if you need.



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  Reply # 170886 13-Oct-2008 16:38
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Yeah those screens in the photo will not have 4 different discrete inputs.  That will be one feed coming from a piece of equipment that combines the 4 inputs.   As mentioned as well, you really want the camera feeds running direct to the recorder as 9/10 this is the most important part of the process, especially if you may want to rely on the footage quality at a future date.

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  Reply # 171393 15-Oct-2008 23:48
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You dont really want to be running a quads output to a LCD TV because you lose so much resolution taking the images down to another crappy analog PAL/NTSC signal. Best to take the VGA out of your DVR machine thru. If it has no VGA out then you will have to look into getting a quad, but they all only output SD so you lose most of the resolution of the source cameras.

There are boatloads on ebay for cheap out of hongkong - I think I ended up spending about $60NZ landed on mine (no ac adapter so cheaper) and its only outputting to a modulator so the crap picture isnt really a problem.




Richard rich.ms

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