I have a Question. When I start a file without this line. libvlc.libvlc_media_player_set_nsobject(mediaPlayer.mediaPlayerInstance(), Native.getComponentPointer(osxCanvas)); I get a new Window where everything is fine. But all Methods libvlc.libvlc_media_player_get_nsobject(...) , libvlc.libvlc_media...