What does mean the blinking play button near the yellow exclamation icon?
Various overlays in the video image provide important status information. The blinking play button near yellow exclamation icon provides you the following information:
Decoding error: The frame might show artifacts due to decoding errors.
You may encounter other blinking icons on the video image. Please refer to the following document, page 58, where you will find the explanation for all icons that that may appear on the screen.