While the experiment is operational, the views usually sequence the different cameras. If you see a black image, the space station is on the night side of the Earth. If you see an image with text displayed, communications switch between satellites and camera streams are temporarily unavailable. Between the camera switches, a black and gray slate will also appear briefly.
The experiment was activated on April 30, 2014 and is mounted on the external payload system of the Columbus module of the European Space Agency. This experiment includes several commercial HD video cameras directed towards the Earth and locked in a pressurized and controlled temperature box. To learn more about the HDEV experience, visit: https://eol.jsc.nasa.gov/ESRS/HDEV/
Note: The camera HDEV cycle is sometimes interrupted, so the video shows only the selected camera streams. This is managed by the HDEV team and is only scheduled temporarily. The nominal video will resume once the team has completed its scheduled event.