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Security Camera-to-DVR Setup on Linux?
mrperkins asks: "I have been asked to help a friend setup a Linux DVR (Digital Video Recording) system for security cameras. Previously this has been done on Windows XP using Avermedia video capture cards from the MP3000 and MP5000 series, and using their bundled software. They have a Linux version but the software is horribly broken. The Windows software allows playback/recording/backup from 4-16 cameras. This works reasonably well but certainly has it's share of problems - the PC's hardware being only one.
Can this be done on Linux using Free Software and compatible hardware? I have heard that the frame rates achievable under video4linux are simply too slow, but I would like to prove otherwise! Are there any software packages that can do this kind of thing (not just a single stream but a fully featured package)? Also, what cards (pref. up to max $200US) would you recommend? If anyone is already doing this kind of thing please let me know what you're using!"
If someone knew the answer to that, they'd be rich already as you would know.
Although the frame rates may be low (I don't know, never tried), I can't imagine a necessity for high frame rates when it comes to digital recording for security. Certainly 5 FPS should be enough to get a good shot at a criminal in the act.
But if you don't want to take any chances, I suppose the higher the FPS, the better.
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Try Motion.
I have a security system for my house running on an older version of Motion. This is what can happen when a gadget-freak has a paranoid girlfriend...
The system has more than three and fewer than nine cameras, some obvious, some concealed in and around the house. Each camera goes into a BT878-compatible card (some dedicated cards, some multiport).
When motion is detected, I can capture on the order of 10-15 fps (not at stunning resolution, admittedly, but 320x240 pixels is good enough for me). If there is motion on two or more cameras, the frame rate decreases. Captured images are saved as timestamped JPEGs in a hierarchical directory structure, along with MPEGs that are assembled of each incident. This is not a particularly mighty machine; it's an Athlon 1800+ with 512MB memory. The limiting factor tends to be the PCI bus when you have a lot of cameras.
Motion supports some nice features. You can set noise and motion detection threshholds on a per-camera basis. You can use a 256-level grayscale image for a sensitivity map, so you can mask certain regions out or decrease their contribution to triggering the recording (useful if plants sway in the breeze). You can label individual cameras with descriptive text ("Front Door"), and all frames are time and date stamped.
I have some custom scripts that manage disk space consumption, deleting the oldest data when drive capacity goes below a set level. I can maintain several week's worth of data in normal conditions. I monitor my setup with a secured Apache setup that groks the file layout, and provides some additional telemetry.
If you need to view data in realtime (normally, I don't), you can use something like Cambozola. If you look at the Motion email archives, you'll find postings on how to run multiple Cambozola applets in a single browser window.
You can do cool stuff, like linking motion detection alarms to scripts. When a known burglary suspect was seen casing the joint, I had some of the cameras send an email to page my phone when they detected motion. Some of the images captured were useful for the police in an ongoing investigation.
Also noteworthy, Motion has one of the friendliest and most helpful communities of any OS project I've been involved with. The mailing list is a great resource, and the maintainers will often go out of their way to help on even the most bone-headed newbie configuration questions on unsupported hardware.
Eloi, Eloi, lema sabachtani?
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... and either:
1) Use XP because that does do the job
or
2) Buy some Axis cameras, spool the captures to your Linux box (preferably with time stamping turned on in the Axis camera), make some mpeg or DiVX videos from the captured images, timestamp as you save them (setup a cron job to do this), and then backup to a secure place.
I've done a few of these installs now and either one of those ways will work. You will ALWAYS have trade-offs (easy route is going to be an XP solution, the more involved route but negligibly cheaper is going to be the Axis solution) so choose wisely. If anyone comes up with another way, I would love to hear it.
CliffH
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I'm a unix administrator. I believe in unix's flexibility and open architecture allows for better system administration, and thus better service/uptime/etc. However, I also firmly believe in using the best tool for the job. If a windows system will allow you to do what you need to do with a minimal amount of work, and a linux solution is not available, or will require a lot of work, use the windows program. That's just common sense.
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Rolling your own through a shell script shouldn't be hard. MPlayer supports grabbing video and compressing it on the fly (see link). So create 2 shell scripts, one to switch files for each camera (have an alpha and beta file), and one to backup the files to your favorite media. Then run a cron job. Every hour (or day) switch the files and do whatever you need with the files. It should even be possible to create redundant copies across the network, so you can keep a copy safe.
Who wants to bet that this an elaborate plan to wire the female dorms with cameras?
Posting a question about security cameras on Slashdot! We know that only the Big Bad Government(tm) uses them.
</flameproof suit>
--- You shall know the truth, and the truth shall make you mad- Neal (not Cowboy) Boortz
Using the Microjack 4-eyes card (way cheaper than 4 separate capture cards). It's got 4 inputs and a BT878 encoder so I have a good feeling I'll get it working.
:-)
The software I'll use is ZoneMinder.
I'll post my success.
If you could be told what you can see or read, then it follows that you could be told what to say or think - BoC
I recently picked up a book entitled Linux Toys by Christopher Negus (link here). Pretty kewl book with a dvr how-to project (all source code on cd).
Disclaimer: I sell these & other dvr type products.
:D
If you are going for Windows use a GeoVision card.
-Their variety of features is better than most. -The question of stability comes down to the OS. The application runs fine for months - Streaming via net, Remote recording etc etc
If you go Linux you can try the HiCap card. It also has a windows software package. The Linux software is not as good as the Windows one but for a home user its pretty good. These cards only go up to 200fps, so for PAL you are limited for 8 cameras for Real-time Display.
Please note that I am still searching for a card supported by Linux that has every feature I would like to sell but for a home user these are more than enough for basic door monitoring while blocking out that waving tree to use motion detection.
Both cards support up 16 cameras - depending on the model with the smallest being 4 (still has same features). Motion etc & pretty must anything else you want.
Price range AU$400-2000.
Google for links. Id be biased
and the monkey flips the switch
I don't record full motion as what I am doing is just for security purposes. I setup up a location with 4-8 Panasonic cameras. they come in different flavors. kx-hcm270 is a wireless outdoor model. It can pan and tilt and has pretty good range. I've gotten over a 1000' range using a wap11 with an ext omni. I set the cameras to upload a pic every 5 seconds. I set up scripts that embed a time stamp on the pic using image magicks convert command. I have a bunch of folders that I share out so people can go back up to 88 hours to look at the pics, at the end of 88 hours, I use ffmpeg to pack the days images into a mpeg file. works great, if someone is interested, I will put together a howto on it.
...how do we knowthat Windows is the best tool for the job?
It might be if there is no network connectivity (a functionality limitation for keeping the worms out). Windows is pretty high maintenance, too.
I sell DVRs based on a CDROM ISO image of debian linux (boots sraight from ROM, so no problems with disks failing etc) and custom software which runs on top of linux.
i use a modified BTTV based card (or a hardware ASIC for more than 4 cameras) with several patches to the regular bttv drivers for multiple inputs and a java application to handle the parsing and recording.
If youre looking for unix based DVRs with multiple cameras i can sell you a unit for upto 64 cameras at rates of up to 2000+ fps.
a real simple kludge would be to have your Linux based TIVO recorder capture line signals fed from a video mux box. receiving input signals any attached video cams. treat the signal like a programmed channel on cable or sat? is ... http://www.computing.net/linux/wwwboard/forum/2537 5.html ... helpful?
From the website:
r ma tion.html
Linux Video Surveillance AKA eLViS provides a user interface for watching motion frames captured by the motion program as JPEG files. eLViS lets you view up to four motion threads and has a simple configuration panel to setup the motion.conf file and eLViS configurations.
eLViS is intended to be used as a low cost security monitoring system. For that reason we have chosen Linux for the high reliability and flexible licensing of software.
We recommend that you use eLViS on a standalone Linux system that is dedicated to this task.
http://www.silicontao.com/software/lvs/doc/info
http://camtrace.nerim.net/francais/produits/ligh t-tech.htm