How to use QAbstractVideoFilter to process frames from camera
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Yes that's right, there is one porblem in the code is that with you code I get a greenscale. So to convert to grayscale the solution is that instead of 0 for chroma, it should be 127 (http://stackoverflow.com/a/20609599/2775917) :
void YUVFilterRunnable::deleteColorComponentFromYUV(QVideoFrame *input) { // Assign 0 to Us and Vs int firstU = input->width()*input->height(); // if i correctly understand YUV420 int lastV = input->width()*input->height() + input->width()*input->height()/4*2; uchar* inputBits = input->bits(); for (int i=firstU; i<lastV; i++) inputBits[i] = 127; }Thanks a lot for your help
@theshadowx I'm glad to help
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Hello!
Is it possible to use the QVideoFilterRunnuble without QML?
As an example I would like to embed it into Camera example ( http://doc.qt.io/qt-5/qtmultimediawidgets-camera-example.html ) to be able to change data format.
Thank you.
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Hello!
Is it possible to use the QVideoFilterRunnuble without QML?
As an example I would like to embed it into Camera example ( http://doc.qt.io/qt-5/qtmultimediawidgets-camera-example.html ) to be able to change data format.
Thank you.
@cs_a994 Don't think so. But you can try to subclass QAbstractVideoSurface.
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@cs_a994 Don't think so. But you can try to subclass QAbstractVideoSurface.
Thank you. I know about this way. But use of filters seams to me more neat.
I tryed to use filters with QML ( in the Camera example ) and did not yet get a result.
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Thank you. I know about this way. But use of filters seams to me more neat.
I tryed to use filters with QML ( in the Camera example ) and did not yet get a result.
@cs_a994
OK. I f you have a questions about qml camera and filters, I will try to help you. -
Thank you. I know about this way. But use of filters seams to me more neat.
I tryed to use filters with QML ( in the Camera example ) and did not yet get a result.
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Thank you very much. I'll study it soon. I hope it will help.
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I get the below error if I try the canny code from git hub. (https://github.com/theshadowx/Qt_OpenCV)
I don't know much about mql but I know QT intermediately.
Thank you
01:45:55: Starting /home/mike/Downloads/Qt_OpenCV-master/QtQuick/build-CannyQml-Desktop_Qt_5_12_0_GCC_64bit-Debug/CannyQml...
QML debugging is enabled. Only use this in a safe environment.(CannyQml:24471): GStreamer-CRITICAL **: 01:45:57.866: write map requested on non-writable buffer
01:45:57: The program has unexpectedly finished.
01:45:57: The process was ended forcefully.
01:45:58: /home/mike/Downloads/Qt_OpenCV-master/QtQuick/build-CannyQml-Desktop_Qt_5_12_0_GCC_64bit-Debug/CannyQml crashed. -
I get the below error if I try the canny code from git hub. (https://github.com/theshadowx/Qt_OpenCV)
I don't know much about mql but I know QT intermediately.
Thank you
01:45:55: Starting /home/mike/Downloads/Qt_OpenCV-master/QtQuick/build-CannyQml-Desktop_Qt_5_12_0_GCC_64bit-Debug/CannyQml...
QML debugging is enabled. Only use this in a safe environment.(CannyQml:24471): GStreamer-CRITICAL **: 01:45:57.866: write map requested on non-writable buffer
01:45:57: The program has unexpectedly finished.
01:45:57: The process was ended forcefully.
01:45:58: /home/mike/Downloads/Qt_OpenCV-master/QtQuick/build-CannyQml-Desktop_Qt_5_12_0_GCC_64bit-Debug/CannyQml crashed.@mikeitexpert
Could you add this issue in https://github.com/theshadowx/Qt_OpenCV/issuesThanks
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here: https://github.com/theshadowx/Qt_OpenCV/issues/5
Is there any way I can convert qml to c++ code just to get an idea how your methods works in pure C++?
Thank you
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Please let me know if there is any update on this.
Mike