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Storing sensor data with video with Linux

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I'm looking for reccomendations for Linux PVR software for a security camera application. I want to be able to store a lot (limited only by hard disk space) of high resolution video from a 3 chip DV camera (which will go through a TV tuner card). So far this is rather standard, but I have the (unusual?) requirement of needing to be able to store a lot of metadata from sensors with the video. (more inside!) So for instance, I'd like to be able to jog through video and see what various sensors were reading at any given moment in the video stream. Some of the PVR systems I've seen use a MySQL database to store video (how exactly does that work, incedentally?) and I was thinking I could perhaps just insert my metadata into the database it used to store data. I, of course, don't know which, if any, of these systems would use a database structure conducive to this sort of thing.

The sensor data would not need to be polled at a particularly high frequency... maybe once every few seconds.

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