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Discussion Starter · #1 ·
Hi all,


I'm trying to find the best way of doing a computer based video surveillance system with video recording capabilities. I want to be able to record video from two locations, my front door and my back door, on a computer hard drive. Tivo does a very similar thing but I can't locate a Tivo box with the correct software version to be able to use it without getting a Tivo subscription. So as an alternative, I thought about trying to do this from a dedicated computer. What I'd like to do is the following, and my questions are included:


1. Using a Linux or Windows based PC with a large hard drive and with a video card can I capture quality video to the computer's hard drive?


2. As I said, I want to have feeds from two video cameras going through the computer's video card with both being recorded. Do I need two video cards to accomplish this?


3. I have an in-house linux based webserver and fileserver. All workstations are windows boxes. I want to be able to view live video from the dedicated video recorder box on any of the PCs and on a few TVs in my home. How would I accomplish this?


4. I have DSL and my webserver is connected to the web all the time. How would I be able to access video from a remote location via the internet?


If someone could help me figure out what software and hardware I would need to pull this off, that would be great. I have built many computers and worked with both Windows and Linux. I have pulled cable through my house as well so wiring a system like this should not be a problem.


Thanks in advance for all the help!


Jeff
 

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I am planning on doing what you are, only with more cameras. I am going to use the GeoVision capture card with software. Their GV800 has outstanding capture rates (up to 120 frames per second) and outstanding features including MPEG4, audio, real-time display, remote playback, web server, PTZ control for some cameras. One thing new that sounds interesting is SRT (smart recording technology) which is a software application which will adjust cameras framerates based on motion input and user defined criteria. This will theoretically greatly increase the effective frame rate of your system. They have cards for 2 cameras up to 16. Check them out at
http://www.geovision.com.tw/en/home.htm


If interested, here is an internet vendor that sells them: http://www.cctvmall.net/videotrans.htm

prices are from 200 to 1000 dollars.
 

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Discussion Starter · #6 ·
Thank you everyone who responded!


prs,


My research also led me to GeoVision's line of capture cards. I especially enjoyed checking out their web-based demo site.


The decision I am now facing is deciding which card I really need. Do you think it is really necessary to have 30 fps from each surveillance camera? Do you think 15 fps or even 7 fps would suffice? The savings in disk space would be considerable. Also the savings in the cost of the capture card is substancial. Do you see any real benefits in the higher frame rate? Identification of vandals etc... could probably be made just as easily with the lesser frame rate. Do you think I'm right about this?


Also, what about video quality? The quality of their web based demo was internet streaming video quality, which is to be expected. Have you seen any sample video that could be downloaded of one of these capture boards in action?


Thanks in advance for all the help.


Jeff
 

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JSDDS,


The new GeoVision 5.x version will allow most of the cards to preview and record a at 640x480. That's better than most smaller video cameras out there. See http://www.geovision.com.tw/en/V50feature.htm for which cards allow this. At 640x480 you should have no difficulty in picking out the guilty vandal out of a line up.


Note, however that the standard recording size is 320x240 and that is the size that the maximum frame rates are quoted at. I would suspect that to record at 640x480 would drop the max frame rate a factor of four.


For your 2 camera setup, a system with 15-30 fps would be probably fine. You can always choose to record at a lesser frame rate to save disc space, too.


I copied these recommendations off a surveillance company site:


_____________________________________________


Examples of Scene Content Vs. Minimum Recording Speed



Parking lots or parking decks

0.5 to 2fps ( if people, not vehicle motion, is the interest )


Hallways

1 or 2 fps, depending on distance and FOV


Lobby or Entrances

2fps


Offices

2fps non-critical


Money counting

3.75 – 7.5 fps


Traffic Surveillance

5 ~ 30fps to record near – fluid vehicle motion


High Stakes Games – Casino

10 – 30fps ( Usually Mandated at 30fps )


Counter terrorism surveillance

30fps


________________________________________________


I am of the thinking that the more frame rate the better, but I am looking at a 16 camera setup. I want to be able to monitor all channels in near realtime, so the GV800 can come darn close (16 cameras @ 7.5 fps --> 120 fps).


You should look at the GV200. Up to 4 cameras (you may want to expand your surveillance down the road) at 15 fps and can record at 640x480. Runs on Win98, so you won't need to upgrade to XP. About 300 clams.


If you want a link to good cameras at great prices, check out Mintron. http://www.mintron.com/Default.htm I am going to go with the 53X11H 1/3" color NTSC (which BTW has 470 TV line resolution) indoors. I don't know about outdoors yet.


prs
 

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Has anyone found any of the PC based systems that will also monitor the audio from the cameras? I have Audio enabled cameras installed and would like to utilize this feature.
 
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