Graphics, sound and multimedia • Frambebuffer not working for Video display

Code:

import cv2import numpy as npimport timeimport osimport fcntlVIDEO_PATH = "rot.mp4"FBIO_WAITFORVSYNC = 1074021920 # TODO: Make it nicerdef load_video(path):    my_video = cv2.VideoCapture(path, cv2.CAP_FFMPEG)    frameCount = int(my_video.get(cv2.CAP_PROP_FRAME_COUNT))    frameWidth = int(my_video.get(cv2.CAP_PROP_FRAME_WIDTH))    frameHeight = int(my_video.get(cv2.CAP_PROP_FRAME_HEIGHT))    FPS = int(my_video.get(cv2.CAP_PROP_FPS))    buf = np.empty((frameCount, frameHeight, frameWidth, 2), np.dtype('uint8'))    cur_frame = 0    ret = True    print(f"Loading video: {path}")    while cur_frame < frameCount and ret:        ret, frame = my_video.read()        cvt_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2BGR565)        buf[cur_frame] = cvt_frame        cur_frame += 1    my_video.release()        print(f"Video {path}, fully loaded\n")    return buf, FPSdef main():    video, FPS = load_video(VIDEO_PATH)    os.system('sudo sh -c "TERM=linux setterm -foreground black -clear all > /dev/tty0"')    fb_fd = os.open("/dev/fb0", os.O_RDWR)    fb_map = np.memmap("/dev/fb0", dtype='uint8', mode='r+', shape=(1080, 1920, 2))    current_frame = 0    last_frame_ts = 0    while True:        fcntl.ioctl(fb_fd, FBIO_WAITFORVSYNC)        fb_map[:] = video[current_frame]        since_last = time.perf_counter() - last_frame_ts        to_wait = (1/FPS) - since_last        if to_wait > 0:            time.sleep(to_wait)        else:            print(f"Player lagging behind by: {(to_wait * -1000):.2f}ms")        last_frame_ts = time.perf_counter()        current_frame += 1        if current_frame == len(video):            current_frame = 0if __name__ == '__main__':    main()

Code:

raspberry@raspberry:~ $ sudo python3 opencv_fb_1video.pyLoading video: rot.mp4Video rot.mp4, fully loadedTraceback (most recent call last):  File "/home/raspberry/opencv_fb_1video.py", line 67, in <module>    main()  File "/home/raspberry/opencv_fb_1video.py", line 49, in main    fcntl.ioctl(fb_fd, FBIO_WAITFORVSYNC)OSError: [Errno 16] Device or resource busy