qml - Why qt webengine can't play youtube live video streams

Question

I was creating a simple webbrowser using webengine. I went to youtube and tried to play a live stream but failed. Same thing happens with every video which requires HTML5 video support in browsers. I didn't saw any recent problems which are identical to this. Qt says that webengine has HTML5 support from they released Qt5. Some old answers to same questions suggest them to compile qtwebengine your own. I tried several attempts and failed(may be my computer can't do the job). Some other say to enable proprietary plugins from the code. But in my case it too didn't work.

Running the code also logs an error WebEngineContext used before QtWebEngine::initialize() or OpenGL context creation failed.

So this is my simple qml code.

import QtQuick 2.12
import QtQuick.Window 2.12
import QtWebEngine 1.0

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")
    WebEngineView{
        anchors.fill:parent
        url:"https://www.youtube.com/watch?v=iL53Y28Rp84"
    }
}

Qt version: 5.15.1(GNU Public License )

Installed using qt online installer.

Answer 1

Your problem is likely that - as the error in the console said - you haven't initialized the web engine. In your main(), you must call QtWebEngine::initialize() before you do any rendering. So your main function should look like this:

#include <QtWebEngine>

int main(int argc, char* argv[]) 
{
    QGuiApplication a(argc, argv);
    QtWebEngine::initialize();
    (...)
}

As per the Qt documentation, the initialize() function makes sure that the OpenGL context can be shared between the GUI and the renderer process. Link to the Qt documentation.