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While playing a video in browser, how to extract an image with 10 seconds delay

asked 2017-12-16 18:46:03 -0600

Guna gravatar image

I need to validate a closed captioning in the video. Part of this work, first I need to extract an image from videos. Please let me how to proceed with this.

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you probably won't have much luck, doing this from within a webbrowser.

try to extract the video url from the html, and use opencv's VideoCapture.

berak gravatar imageberak ( 2017-12-17 12:20:10 -0600 )edit

I can able to extract the video URL from the browser. could please let me know how to proceed with opencv's VideoCapture??

Guna gravatar imageGuna ( 2017-12-17 16:02:11 -0600 )edit

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answered 2017-12-18 02:14:35 -0600

berak gravatar image

so, using java, try something like this:

String video_url = "???";
VideoCapture cap = new VideoCapture(video_url);
long t0 = Core.getTickCount();

while (cap.isOpened()) {
    Mat im = new Mat();
    // read continuously, else you get stale images
    if (! cap.read(im)) 
         break;  // end of video reached

    long t1 = Core.getTickCount();
    double seconds = (double)(t1-t0) / Core.getTickFrequency();
    if (seconds >= 10) {
        t0 = t1; // reset timer
        // 
        // process your frame for OCR
        //
    }
}
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Thanks! Let me try with this.

Guna gravatar imageGuna ( 2017-12-19 10:17:13 -0600 )edit

I have tried with above example, but facing an issue in cap.isOpened - It always returns false. Is their anything else i have to do on this??

cap.open() - Its related web camera ?? @berak

Guna gravatar imageGuna ( 2017-12-19 14:47:02 -0600 )edit

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Asked: 2017-12-16 18:46:03 -0600

Seen: 150 times

Last updated: Dec 18 '17