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cctv_down_under

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Posts posted by cctv_down_under

  1. Posted

    good answer.

     

    Also, if they really wanted real time, like a casino, they would need single channel DVRs for each channel, so if they had 10 cameras, thats 10 single channels DVRs:

     

    Wrong, you can have 400Fps machines (Pal) that is real time on 16 cameras.

     

    Also you can get good quality on Mpeg4 otherwise everyone would not be striving to develop the chips, no debate that Mpeg 2 is much nicer but WAY too big on file size unless very heavilly compressed and if it is then it becomes below par.

     

    I havent seen many other than Geo that do the Smart frame buffering.

     

    You use a looping switcher but do not record from it as the cameras go straight through it to your DVR, Its like interrupting each camera into a box allowing the choosing of any full screen view of a camera at another location (where the switcher is) and then each camera still goes to the DVR as if the switcher was not there..... an example.

     

    Imagine a Guard room and a server room, the DVR would sit in the server room and most people on the network in the building can view all cameras on their pc's but the guard room at the front gate may not have a computer in it, therefore you run all cameras to the switcher in the Guard room then back from the loops to the DVR, the DVR works like nothing has changed and the Guard can press any button to view any area he wants on a full screen large view.

     

    A switcher is about 1/8th the price of a Mux, therefore it is a very cheap way to have more than one controll of the DVR and you can also wire alarm sensors to it so that movements around the area will trigger a full screened view for the Guard.

  2. Posted

    It only does 25FPS which is pretty poor over 16 cameras, a bit overpriced considering, My new guy found out soem interesting stuff that I have yet to test but he found that downloading remote files had to be like 2mb for 5mins, when on the highest setting... I do not know if this is right but that semms an awefull lot, byt he way Rory, your Kalatel is ACTUALLY A PC!! Has ram sticks proccessor and everything, thats why it can run a CD drive, it must run an embedded Linux or something but it is still a PC!

  7. Posted

    I ahd a good look at nuvico it seems ok but the remote demo was very slow and seems to be using very heavy wavelet compression, but If it is cheaper than the Kalatel I would be keen to have a closer look, does anyone know if they wil be at the Taiwan show?

  15. Posted

    Already did that, (told Geo), they just said " not that Alan guy again " I am very tired up with some big projects so it will be someone else that will have to go.. any input you have on what t o look for would be invaluable, the show is on or around the 23rd I think.. Hay Alan can I call you to get some advice on a tender, it is a big scope job, maybe...GULP.... even too big for me, could use some advice can you email me any tender answers you have sent that I may use as a template guide!

  16. Posted

    a PC is never stable, no matter what you do to it. Linux may be different, never used it.

     

    Anything electronic can freeze up, its up to you.

     

    Thats Bull****!!!!

    Tell that to Nasa or your Doctor.. thats pure garbage!

    Yes standalones are more stable but by what, I sell both and they are very similar...I crashed the Kalatel just the other day.. so go figure.. yes windows is not as reliable as linux but to say that a PC is not stable is pure Bull****, log into my machine and check its uptime, builders of machines are the people who are unstable!

  18. Posted

    1. Have any of you ever used "Sentry" brand cards? If so, how does the quality compare with GeoVision cards?

     

    I have never used them, however I think someone in this forum actually sells them, Sentry is not the manufacurer. I have seen nothing better than the Geo software. but I would kill to find something, I would imagine it is not better but may be close.

     

    2. Have any of you ever built a 32-camera PC-based system with "stacked" cards? If so, how do you "stack" cards and how well did the system work?

     

    Yes I have tried stackable cards, it means that you use two x 16 Channel PCI cards, it should not double the frame rate though, especially on larger images unless onboard compression is used. The one I tried became very unstable with two boards.

     

    These cards are rather pricey, and I imagine that two PCs with 16 cameras each would perform better than one PC with 32 cameras anyway, though it would be nice to be able to record 32 cameras on one PC. Opinions?

     

    If it were me I would build two machines, it all depends how you plan to watch it, if it sits in a server room who cares but if it is right in front of you then maybe 32 on one screen would be handy, probably be very small images though

     

     

    What's the difference between 640 x 480 and 640 x 480-SW?

     

     

    On some DVR's that have not fixed interlacing problems you will view what is like a tearing or blurring of larger or faster moving objects, the SW stands for Software Interlacing and makes the viewing better.

     

    Question about fps rates:

    The overall max fps for the GeoVision 800 is 120 fps (NTSC). As I understand it, that is is based on 320 x 240 recording resolution. About how much slower is the fps when recording 640 x 480? I just sent an email to GeoVision to request an answer to this question, but I'd also like to know your actual experiences with the cards.

     

    I am 100% sure you will get a different answer formt he Geo tech department, each one answers the same question differently, seems only the head techs and engineers know much about stuff.

     

    It will depend on your system CPU, Bus speed and and Motherboard make, however worst case scenario for us has been about a 35% loss in frames and best around 17% loss, this is true of all cards that do not have onboard compression

     

    Do you forsee a time when GeoVision, for example, will stop making DVR cards for PCs? If we put together a PC-based system now, will it be obsolete in two years? Will the manufacturers still offer support?

     

    Yes and No I can't see PC Cards tottaly stopping as they are easier to develop software for, but yes there is a big trend towards standalone machines and not just for stability, they are cheaper to manufacture, therefore if Geo made one they would make even more proffit.

     

    Standalone systems will be the mainstream in my belief within 2 yrs time, I know Geo is already working on it, but at present they are still a ways behing PC based systems but are gaining rapidly

     

    If their budget doesnt call for it, or its just like a home system, then PC card all the way

     

    This is a bad statement, PC Cards are much more advanced than standalones and most large projects use PC rather than standalone as they have more flexibilty. I would say standalone is more stable but not by that much, PC can be updated while it is much harder with a standalone, if your unit is obsolete you need to replace all of it with a standalone, however if it is a PC it may be a simple upgrade, also a standalone is just like a PC with video display chips etc, the only difference is that if the video chip goes in a standalone you need to replace the whole thing not just a video card in a PC.

     

    An example.... Geo released a hardware overlay feature for newer video cards, so upgrading your video card alone gave new features, but had it been standalone you would not be able to, besides standalones are not as flexible with remote features.

     

    I wouldnt mind getting my hands on one of those kodicom 4 ch DVRs with the built in LCD

     

    hey allan, I just quoted McDonalds Bahamas on CCTV (using the storesafe), will wait to see what happens )

     

    Rory if you want to remotely log into any Maccas here let me know we did about 16 of them! A tip for you.... tell them it will help with training and their cash SOP.

  21. Posted

    1/ There is very little gap with stabilty if a PC based machine is BUILT correctly and you use a good card like Geovision, but yes they are more stabe.

     

    2/ Can someone please PM the price of a Nuvico for testing

     

    3/ Normal HDD is all they use, they just charge for their time, also it takes some time for person doing pricing to make adjustments to the PC Markets prices.

  25. Posted

    I agree it is a myth, Most SECURITY Instalers have no idea when it comes to PC's, I would be out of business if they broke as often as everyone says!

     

    The problem is that builders of PC's dont know what they are doing, it is bad that a PCI card can get the blame for someone lumping two HDD's together and causing overheating..

     

    PC's werent used in security before and that is why security companies that have to adapt build badly built machines and then the whole windows debate comes in..

     

     

    To be honest most failures are hardware and not Windows, however I would go as far as to say that yes Standalones are more stable, but not by as much as everyone thinks, I actually managed to crash the Kalatel.

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