12 cams, 24fps, 720x576, modetect...

trendkill82 · Post by **trendkill82** » Tue May 22, 2007 5:43 pm

Hi guys, i just wanna do a zoneminder system with 12 analog cams.
It must have modetect, when recording i need 24 fps with PAL resolution and 10-20 frames buffering before recording. I want to store 3 months in the hard disk. I think i will use 4xBT878 chips per capture card with 4 inputs (3 PCI cards). My questions:
-What hardware i need to record? (CPU, RAM). SMP or single CPU? How many megabytes of RAMs?
-How many gigabytes HDD i need for 3 months? SATA or SCSI?

sorry for my english....

thanks!!!!

jameswilson · Post by **jameswilson** » Wed May 23, 2007 1:40 am

Hi
Id probably rethink this
12 cams @ 24 fps per cam is 288 frames per second
D1 has 4x the load of cif and a dualcore FX55 will do about 200 frames per second at CIF, so a new quadcore intel 'may' be able to handle this but its unlikly. Also i think youd swamp your pci bus with amout of data on 1 machine. I think your gonna need a few machines with less cams on, or limit your frame rate to around 50 fps global @D1

Also if you see the wike there is a basic HD calculator and using an image size of about 60K (720x576 and lowish compression) you will need around 50 Terrabytes to record at 24 fps per cam for 31 days.

Flash_ · Post by **Flash_** » Wed May 23, 2007 7:59 am

I agree with James. 24fps is extremely high for recording and I'm wondering if you've just picked this number out of the air or whether you do actually have a requirement for this speed?

I do 20 ip cams on a standard x2 4600 PC, but that's split modect and record and 640 and 320. They work at around 3-5 fps each and I keep 3 weeks on a single 500gb disc.

You also don't mention colour. Mine are all B&W, makes a *huge* impact on speed and storage.

trendkill82 · Post by **trendkill82** » Wed May 23, 2007 8:31 am

Ahh, I see... The minimum is 15 FPS, but they want the 720x576 colour resoultion. The storage will be 2-3 terrabytes, maximum is 5.
We can buy dual XEON processors, and 2-4 gigabytes of RAM.
And what about ffmpeg compression?
I checked the geovosion cards.. There are the GV1000-16. This can 400 FPS with PAL resolution, with hardware compression. It needs only one PCI slot. But sorry its only for windows... Do you know any alternate hardware compression card with V4L/zm support? 64bit PCI card will be great too.
Can i use any hardware compression capture card in linux?

trendkill82 · Post by **trendkill82** » Wed May 23, 2007 12:57 pm

hmm... or what about this card?:
http://www.provideo.com.tw/MPEG4-DVRCard_266.htm

1.Video Input -- 16 ports composite video signal
4.Frame Rate -- NTSC: 30fps / PAL: 25fps (480/400 fps)
PV-266 supports Windows 2000, Windows 2003, Windows XP and Linux operating system.

what do you think abot this, and with the 2 xeons, and 4 gb of rams with 3 terrabytes?... with zm?

trendkill82 · Post by **trendkill82** » Wed May 23, 2007 4:46 pm

or this:
http://dvr.neugent.net/products/lx-16480.php