The following is built in debug mode and started with debug

This issue has been present in both 6.2.4 and 6.6.0 versions, but I'm not sure if it appears in the intermediate version (I think it's probably always there)

I use the QMediaPlayer object to play the video, and I use the QGraphicsVideoItem object as the canvas for the video, and then as soon as the play function is called, the following exception appears

Exception at 0x7fff50be531c, code: 0xe06d7363: C++ exception, flags=0x81 (first chance) in MessageBus!messageBusRemoveObserver

There is one more line of output : 

failed to get textures for frame; format: 172 textureConverter null