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Process video in OpenCV, without playing it

asked 2018-05-01 21:54:06 -0600

I have code, which is able to capture faces, when it crossing a line in video, after that app will save it to local direction. Is it possible to process this application, with prerecorded video, but no playing it.

Means, if I have 2 hours video, how can I take all faces in video, within few minutes?

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answered 2018-05-02 01:24:44 -0600

berak
32993 ●7 ●81 ●312

updated 2018-05-02 01:25:14 -0600

no, it's not possible, to process a video without "playing it".

you as a human don't have to watch it, so no need for imshow() / waitKey().

still, 2 hours video means ~ 7200*30 frames to process. if you use haarcascades to detect faces here, and processing a single frame takes close to a second, it will take long.