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Blocking after call VideoCapture set CV_CAP_PROP_POS_MSEC

asked 2018-07-11 10:56:09 -0500

chuliqiang gravatar image

updated 2018-07-11 20:06:28 -0500

We use OpenCv to play a http url video.We use VideoCapture get a wrong frame number from video(possible my video format having problem). but when use VideoCapture set frame index for a wrong number. OpenCV will blocking. Please help me.

string m_strFilePath = szFilePath; //url  http://172.20.32.211:8080/123.avi
m_vidCapture.open(m_strFilePath);
double fTotalFrams = m_vidCapture.get(CV_CAP_PROP_FRAME_COUNT); //get wrong frame number
m_vidCapture.set(CV_CAP_PROP_POS_MSEC, nPosTime); // set wrong frame number rely on wrong total frames number,it will blocking for a long times
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answered 2018-07-12 01:38:14 -0500

berak gravatar image

properties like CAP_PROP_FRAME_COUNT or CAP_PROP_POS_MSEC only make sense for video files , not for ip cams, where those are not supported at all (or report bogus values).

remove those lines from your code. you can't "seek" in an ip cam webstream.

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Asked: 2018-07-11 10:56:09 -0500

Seen: 18 times

Last updated: Jul 12