All of our course videos are captioned, and you can click the CC button on the video player to bring up a scrolling transcript of the video content on the right side of the player.
But sometimes, separate from this transcript, subtitles in white text on a black background will appear over the bottom of the video. This happens because Closed Captioning is enabled on YouTube for your browser. To solve this problem, click on the video and then press Shift-C on your keyboard (like you're typing a capital C). This should toggle YouTube's captions on or off.
If that doesn't work, click on the YouTube logo on the bottom right of the video player to open the video in YouTube:
On the new YouTube tab, click the CC button to toggle closed captioning off. This will remove the subtitles from all videos on lagunita.stanford.edu (but the scrolling transcript will remain available). If the change doesn't happen immediately, try refreshing the Lagunita tab. Clearing your browser's cache and cookies may also help.