Youtube thought it would be just great to allow anybody and everybody to put comments within a video. Often it is just annoying. Here is how to disable these annotations or text comments within the youtube video.
Please, please… let us disable all of this text markup of our youtube videos.
1. Log into youtube. Click on your account link in the upper right hand corner.
2. Click the Playback Setup tab in the left hand column
3. Click Annotations and unselect Show annotations checkbox. Click Save Changes button.
Now, all the annotations will be disabled from the videos you watch. Remember this setting will only work while you are logged in.