Orchid Fusion VMS supports a recording style that will record video only when motion is detected. Because of this, when you review recorded footage, some Players will not always display video.
Players associated with this recording style will provide a countdown to the next motion event. (This way, even when no video is displayed, you will know that the camera and the system are still working.)
You may see a similar countdown (even on Players using other recording styles) when a Player simply doesn’t have any recorded video for the specified time period.