How to use QAbstractVideoFilter to process frames from camera

medyakovvit

@theshadowx I'm glad to help

cs_a994

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.

medyakovvit

@cs_a994 Don't think so. But you can try to subclass QAbstractVideoSurface.

cs_a994

@medyakovvit

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.

medyakovvit

@cs_a994
OK. I f you have a questions about qml camera and filters, I will try to help you.

theshadowx

@cs_a994

I have put a QtQuick app in github using QAbstractVideoFilter with OpenCV.

I hope it helps you.

Cheers

cs_a994

@theshadowx

Thank you very much. I'll study it soon. I hope it will help.

mikeitexpert

@theshadowx

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.

theshadowx

@mikeitexpert
Could you add this issue in https://github.com/theshadowx/Qt_OpenCV/issues

Thanks

mikeitexpert

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

mikeitexpert

Please let me know if there is any update on this.

Mike