Playing video with movieStim3 happen to video frame rate to decrease

I used movieStim3 to import the video into psychopy, and the result was twice the normal playback time and the frame rate was very slow. I am very troubled, do not know any good solutions?
I guess I added the code for real-time recording of x and y coordinates in the loop after mov.draw() and win.flip(), which caused the video frame rate to decrease and the video playback time to become longer. Are there any other code statements for playing videos?