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Linux command-line grab one jpeg frame from BCH08240 port

I have a BluecherryDVR server running well, and would like to be able to access the camera devices from programs external to the DVR. I have so far been unable to properly use the v2 API calls to do this.

Specifically, I'd like to grab a single frame from a camera and save it as a jpeg for use by a computer vision program. At first, just grab it using something from the command-line: ffmpeg or similar.

Has anyone been able to do this yet?

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