I Want a Video Server

There's a device I want to buy:

• On the input side, composite video and sound -- at least four inputs capable of handling the feed from security cameras. Not digital, not USB -- just cheap cameras.
• Processing: Support for video motion detection would be good.
• And output: a stream server for live-ish video and automatic upload of motion-detecting images to a remote SFTP server. Email/text alerting driven off the motion detection makes it useful.

One of these in the attic with some strategically placed cameras would provide some worthwhile security.

It's essentially just the works from an IP camera -- it should be a few hundred pounds at Maplin. But it doesn't seem to exist. Bummer.