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I have a WMV file that's 5 hours long. It's mostly just a camera focused on the entry door.

Is there any software where I can throw this file at it and it would find time segments where there is actual movement?

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up vote 2 down vote accepted

Transcode the wmv to mjpeg and feed it to motion.

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You can try this CodeProject article on Motion Detection Algorithms. Looks really good. Software is freely downloadable and modifiable.

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Get Webcam Zone Trigger - you can use video files as input.

Add a motion detection hot spot on the door. Set its action to take a picture or to make a noise... go to the settings and enable text logs if you want to get a list of all offset time where motion is detected.

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