QMediaPlayer not working on Windows 7 Pro x64

  • I'm experiencing a wierd issue with Qt Multimedia framework.
    I'm trying to run the simple videoplayer example using Qt 5.5.1 under Windows 7 Pro x64.
    As I select a regular mp4 video file, I have the following error :

    Failed to set topology

    I really don't understand where it comes from.
    I haven't found any related information over the internet.
    Actually, I don't even understand the meaning of this error...

    Any suggestion is welcome.

    NB: Note: before installing Qt 5.5, I have also installed video codecs with "K-lite Codec Pack"


  • Lifetime Qt Champion


    It comes from the media foundation backend.

    What do you mean by regular mp4 ? What are the streams format ?