How to Display Multi Webcam with QT + OpenCV + Eclipse?

**thaihoangluu** · 28th December 2011, 09:39

Originally Posted by ChrisW67

This question still has nothing to do with Qt

You never initialise capture1 with a valid, non-NULL pointer so you are probably going to crash the program at line 34 when you first use that pointer. If you had not commented out the checks between line 22 and 30 you would have known this.

You only create a single display window called "result", and then try to output two video streams to windows called "Left" and "Right" (which don't exist), and finally clean up a two windows called "result" (which exist) and "result1" (which does not).

Okay, Thank you very much, can you share code for Multi webcam Display on multi QLabel?
And resolve error when i start program

THANKs

**ChrisW67** · 28th December 2011, 21:18

Originally Posted by thaihoangluu

Okay, Thank you very much, can you share code for Multi webcam Display on multi QLabel?

No. I have never done any OpenCV programming to share. Everything I am telling you comes from a brief scan of the OpenCV documentation and the example here. Thread 45669 shows one way to convert an OpenCV frame buffer into a QImage/QPixmap that you can use with a QLabel. It also offers an alternate approach.

And resolve error when i start program

Select one. If it keeps asking then you might need to ask in an OpenCV forum why OpenCV triggers this behaviour in Windows and how to avoid it.