QMediaPlayer doesn't work with dsengine.dll when trying to play RTSP via IP-Camera (for example). In case when application is running through Qt Creator (debug or release - nevermind) and starts QMediaPlayer, it works fine without issues. But after building project and installing it on other machine (dynamic link) - video not starts.
Error log said: The QMediaPlayer object does not have a valid service or QMediaPlayer::ServiceMissingError wich means the same.
Problem causes dsengine.dll. If change it to library from Qt 5.7 version or earlier - application runs RTSP correctly.