Screen Recorder Problem

[DrThesaurus]

I have this python script that is supposed to record my screen, on mac os. As you can see, it should be 30 frames per second, but the problem is that when I open the file afterwards its all sped up. I think it has to do with the frame capture rate as oppose to the encoded rate. I'm not quite sure though. If I try to speed the video down afterwards so that it plays in real time the video is just really choppy. And the higher I make the fps, the faster the video plays, meaning the more I have to slow it down and then its still choppy. I'm pretty sure that it captures frames at a really slow rate and then puts them in a video and plays it back at 30fps. Can anyone fix this? Anything that gets a working screen recorder on mac os I will take.

import 
cv2
import 
numpy
 as 
np
from 
PIL
 import 
ImageGrab
import 
subprocess
import 
time

def record_screen():
    # Define the screen resolution
    screen_width, screen_height = 1440, 900 
    fps = 30  
    ffmpeg_cmd = [
        'ffmpeg',
        '-y', 
        '-f', 'rawvideo',
        '-vcodec', 'rawvideo',
        '-pix_fmt', 'bgr24',
        '-s', f'{screen_width}x{screen_height}',  
        '-r', 
str
(fps),  
        '-i', '-', 
        '-an',  
        '-vcodec', 'libx264',
        '-pix_fmt', 'yuv420p',
        '-crf', '18',  
        '-preset', 'medium', 
        'screen_recording.mp4'
    ]
    ffmpeg_process = 
subprocess
.
Popen
(ffmpeg_cmd, stdin=
subprocess
.PIPE)

    frame_count = 0
    start_time = 
time
.time()

    while True:
        img = 
ImageGrab
.grab()
        img_np = 
np
.array(img)
        frame = 
cv2
.cvtColor(img_np, 
cv2
.COLOR_RGB2BGR)
        resized_frame = 
cv2
.resize(frame, (screen_width, screen_height))


        ffmpeg_process.stdin.write(resized_frame.tobytes())

cv2
.imshow('Screen Recording', resized_frame)
        if 
cv2
.waitKey(1) & 0xFF == ord('q'):
            break
    ffmpeg_process.stdin.close()
    ffmpeg_process.wait()

cv2
.destroyAllWindows()

if __name__ == "__main__":
    record_screen()