On embedded Linux with EGLFS platform plugin.

Trying to capture from Window (see QTBUG-117877 ) leads to an error message suggesting capturing works with composited windows only, but that doesn't work either and just leads to an abort() call because capture happens in a new thread which cannot access OpenGL context of the window.

Running attached application leads to this output:

qml: starting screen capture
qt.multimedia.ffmpeg.surfacecapturethread: Screen capture rate has been changed: 60
qt.multimedia.ffmpeg.surfacecapturethread: start screen capture thread
Cannot make QOpenGLContext current in a different thread