ffmpeg when use overlay output have delay

Question

I Use Ffmpeg For Overlay Png on short video : For Example 5 seconds video I Use This Command :

-i C:\\part1.mp4 -i C:\\txt1.png -filter_complex \"overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2\" -c:v libx264  -pix_fmt yuv420p -codec:a copy C:\\outputtext1.mp4

but output when play have delay Please Help me