How can I save a video for a length of time?

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asked 2017-01-30 21:09:33 -0600

j0h
106 ●4 ●7 ●13

I have a video stream going, and object detection. If I detect an object, I want to stop detecting, save video for N seconds. I wrote a function, but its not right. After naming the file based on date and time, I'm not sure what to do. There is only 1 camera, and I am working on a linux system.

Should I close the existing video stream, then open another and save video for N seconds?

If I interrupt the video stream, I will get quality issues related to exposure, in the first few frames. Exposure settings are not supported on my camera in openCV.

I tried appending a stream and also tried saving a separate stream concurrently, but both resulted in problems.

Is there a preferred method to save parts of a video stream without interrupting the stream? if there is, can i get an example of that?

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struct VideoLimited { VideoWriter f; TickMeter t; }; void main() { VideoLimited v; v.f.open("myvideo.avi",videoWriter('M','J','P','G'),20,Size(640,480)); if (!v.f.isOpened()) return; v.t.start(); for (;;) { .... if (v.f.isOpened() && v.t.getTimeSec()<10) // I don't check timing for video write... v.f.write(img); else v.f.release(); ... }

How can I save a video for a length of time?

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How can I save a video for a length of time?