Sync and Video : Working with Video in Pro Tools : Video Engine Rate : Video Engine Rate Indicator

Video Engine Rate Indicator
The Video Engine Rate indicator displays only in the main video track (whether it is online or offline) and shows the video engine rate, which is the number of video frames per second output by Pro Tools.
 
The Video Engine Rate indicator is normally black, but turns red if one of the following conditions are present:
*   
The video engine rate does not match the session’s current Timecode Rate setting.
– or – 
*   
A pull up has been applied to the video, causing the video engine rate to differ from the session Timecode Rate.
*
The Timecode Rate is set in the Session Setup window. For more information, see Session Setup Window.
*
See Pull Up and Pull Down for detailed information on using video pull up and pull down.