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I started work on a DVR for a former customer to replace their MPEG-2-based system with something more modern, but didn't get to finish before they went with something off-the-shelf.  I had picked up one of these:

http://store.bluecherry.net/bluecherry-bc-h16480a-16-port-video-16-port-audio-h.264-pcie-hardware-compression-capture-card.html (http://store.bluecherry.net/bluecherry-bc-h16480a-16-port-video-16-port-audio-h.264-pcie-hardware-compression-capture-card.html)

It captures up to 4 composite-video inputs at 704x480 at 30000/1001 fps, 16 inputs at 704x480 at 7500/1001 fps, or 16 inputs at 320x240 at 30000/1001 fps.  It also captures mono audio on each input, if you need it.  Bluecherry has its own Linux-based DVR software (go here (http://www.bluecherrydvr.com/) for more information), or you can just grab their V4L2 driver from GitHub (https://github.com/bluecherrydvr/solo6x10) and roll your own. (I think it's also supposed to work with ZoneMinder, but not in H.264 mode.)

(Click any of the images to enlarge.)

https://dl.dropbox.com/u/57535575/DSCN0830.scaled.jpg (https://dl.dropbox.com/u/57535575/DSCN0830.jpg)

https://dl.dropbox.com/u/57535575/DSCN0831.scaled.jpg (https://dl.dropbox.com/u/57535575/DSCN0831.jpg)

https://dl.dropbox.com/u/57535575/DSCN0832.scaled.jpg (https://dl.dropbox.com/u/57535575/DSCN0832.jpg)

The card comes with video and audio breakout cables.  The video breakout cable plugs directly into the card; the audio breakout cable plugs into the bracket connector, which plugs into a connector on the card.

This card needs a Linux PC with a PCIe 1x slot. Windows drivers are not available, at least not from Bluecherry. It uses a SoftLogic Solo6110 (http://www.softlogic.co.kr/product/solo6110) hardware H.264 compression chip, as you can see from the pictures above.

They sell new for about $300. If I could get $240 (or the equivalent in BTC at time of purchase...a hair over BTC20 as I post this), that'd be high-speed. I'm also open to trade: my hashrate is pretty pathetic right now, so if you'd like to put some security cameras on your mining rig, home, etc., maybe we could trade my capture card for a couple of Radeon 5850s or 5830s. This would be my first sale or trade here, but my eBay feedback (http://myworld.ebay.com/s.alfter) is flawless. I'm OK with escrow.

If you're interested, I can include a tarball or (maybe) a Subversion dump of the software I was working on.  I had it capturing on four inputs at full resolution and framerate, writing raw H.264 video and index files to a directory, and deleting old files as necessary.  I hadn't gotten around to writing a viewer, but you can concatenate the files and write them to .mkv or .m4v files with standard utilities for those purposes.