OpenCV IP Camera connection
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I'm trying to connect IP camera in Qt. For which I'm using OpenCV library. My Qt version in 5.15.2 and the OpenCV library which I have downloaded is 4.7 . Upon Building the project error hits..
The errors are:
error: undefined reference to `cv::VideoCapture::VideoCapture()'
error: undefined reference to `cv::Mat::~Mat()'
error: undefined reference to `cv::waitKey(int)'
error: undefined reference to `cv::VideoCapture::read(cv::_OutputArray const&)'
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I'm trying to connect IP camera in Qt. For which I'm using OpenCV library. My Qt version in 5.15.2 and the OpenCV library which I have downloaded is 4.7 . Upon Building the project error hits..
The errors are:
error: undefined reference to `cv::VideoCapture::VideoCapture()'
error: undefined reference to `cv::Mat::~Mat()'
error: undefined reference to `cv::waitKey(int)'
error: undefined reference to `cv::VideoCapture::read(cv::_OutputArray const&)'
Hi,
Are you linking to the OpenCV libraries ?
Which of them ?
Are they for the correct architecture ?
Are they from a compatible compiler ? -
I'm trying to connect IP camera in Qt. For which I'm using OpenCV library. My Qt version in 5.15.2 and the OpenCV library which I have downloaded is 4.7 . Upon Building the project error hits..
The errors are:
error: undefined reference to `cv::VideoCapture::VideoCapture()'
error: undefined reference to `cv::Mat::~Mat()'
error: undefined reference to `cv::waitKey(int)'
error: undefined reference to `cv::VideoCapture::read(cv::_OutputArray const&)'
@Vijaykarthikeyan Please don't double post!
You asked exact same here: https://forum.qt.io/topic/145873/how-to-connect-ip-camera-using-opencv-library-for-the-qt-version-5-15-2-im-trying-to-display-the-ip-camera-output-in-qml-window
And failed to answer my questions... -
Hi,
Are you linking to the OpenCV libraries ?
Which of them ?
Are they for the correct architecture ?
Are they from a compatible compiler ?@SGaist Yes,sir.
I'm using OpenCV 4.7 version.
My compiler version is MINGW 8.1.0 32 bit compiler
My Qt version is 5.15.2
I actually dont know whether they are compatible..
Upon linking, I get the error like undefined reference..
This is the library which I have linked with Qt
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@Vijaykarthikeyan Please don't double post!
You asked exact same here: https://forum.qt.io/topic/145873/how-to-connect-ip-camera-using-opencv-library-for-the-qt-version-5-15-2-im-trying-to-display-the-ip-camera-output-in-qml-window
And failed to answer my questions... -
@jsulm Sorry Sir..I really dont know what exactly you asked there.
@Vijaykarthikeyan I asked:
- what compiler was used to build OpenCV?
- And I'm not sure whether the OpenCV library you're linking is the only one you need. Check what other libraries are there and which you need.
I will not ask again...
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@Vijaykarthikeyan I asked:
- what compiler was used to build OpenCV?
- And I'm not sure whether the OpenCV library you're linking is the only one you need. Check what other libraries are there and which you need.
I will not ask again...
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@jsulm The compiler is MINGW 8.1.0 32 bit compiler
I have gone through some pages and conluded that OpenCv 4.7 is compataible with Qt version 5.15.2
@Vijaykarthikeyan
Do you mean MinGW itself is 32-bit but you are building for 64-bit, or do you mean you are building for 32-bit? Because your OpenCV path containsx64...? -
J JonB referenced this topic on
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V Vijaykarthikeyan has marked this topic as solved on
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@Vijaykarthikeyan
Do you mean MinGW itself is 32-bit but you are building for 64-bit, or do you mean you are building for 32-bit? Because your OpenCV path containsx64...?@JonB Thank you, Sir.. You are correct. There's a mismatch between the versions. Now, I have sort out the error.
