Sometimes, if you authored your DVD incorrectly, it's possible people will have trouble playing it. It's best to try VLC media player in these cases to verify the contents of the disc.
Go HERE: https://www.videolan.org/vlc/
Download and install. Only download from videolan.org
When using VLC, Choose the playback - Title- Title 1. This should play the video.
Keywords: video, playback, dvd not working, testing, compatibility.