v4l2loopback: 'error writing frame: Invalid argument' when cam.send() about pyvirtualcam HOT 4 CLOSED

import os
import sys

import cv2
import numpy as np
import pyvirtualcam


if __name__ == "__main__":
    video_path = '/workspace/test_virtual_camera/demo_video/demo.mp4'

    video_capture = cv2.VideoCapture(video_path)
    frame_height = video_capture.get(cv2.CAP_PROP_FRAME_HEIGHT)
    frame_width = video_capture.get(cv2.CAP_PROP_FRAME_WIDTH)
    frame_count = video_capture.get(cv2.CAP_PROP_FRAME_COUNT)
    fps = video_capture.get(cv2.CAP_PROP_FPS)

    frame_rgb_list = []
    for frame_idx in range(int(frame_count)):
        _, frame = video_capture.read()
        frame_rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        frame_rgb_list.append(frame_rgb)

    with pyvirtualcam.Camera(width=int(frame_width),
                             height=int(frame_height),
                             fps=int(fps)) as cam:
        print(f'Using virtual camera: {cam.device}')

        video_capture_virtualcam = cv2.VideoCapture(0)

        n = 0
        while True:
            frame = frame_rgb_list[n]
            cam.send(frame)
            cam.sleep_until_next_frame()

            ret, frame_from_virtualcam = video_capture_virtualcam.read()
            cv2.imshow("frame_from_virtualcam", frame_from_virtualcam)
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break
            if n == 10:
                break
            print('==>>', n)
            n += 1

        video_capture_virtualcam.release()
        cv2.destroyAllWindows()

        sys.exit()