我想这会解决你的问题

# importing the module
import cv2 
import numpy as np
# reading the vedio
source = cv2.VideoCapture(0)  // add your URL insed of "0"
# We need to set resolutions.
# so, convert them from float to integer.
frame_width = int(source.get(3)) 
frame_height = int(source.get(4))
recording = False
fcc = cv2.VideoWriter_fourcc(*'XVID')
size = (frame_width, frame_height) 
fgbg = cv2.createBackgroundSubtractorMOG2(varThreshold=200, detectShadows=0)
result = cv2.VideoWriter('output.avi', fcc, 30, size) 
# running the loop
while True: 
    # extracting the frames 
    ret, frame = source.read() 
    fgmask = fgbg.apply(frame)
    nlabels, labels, stats, centroids = cv2.connectedComponentsWithStats(fgmask)
    for index, centroid in enumerate(centroids):
        if stats[index][0] == 0 and stats[index][1] == 0:
            continue
        if np.any(np.isnan(centroid)):
            continue
        x, y, width, height, area = stats[index]
        centerX, centerY = int(centroid[0]), int(centroid[1])
        if area > 200:
            cv2.circle(frame, (centerX, centerY), 1, (0, 255, 0), 2)
            cv2.rectangle(frame, (x, y), (x + width, y + height), (0, 0, 255))
            cv2.putText(frame, str(area), (centerX, y), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 255))
    # displaying the video 
    cv2.imshow("Live", frame) 
    k = cv2.waitKey(1) & 0xff
    if k == ord('r') and recording is False:
        print('recording start')
        recording = True
    if recording:
        result.write(frame)
    if k == ord('e'):
        print('recording end')
        recording = False
        result.release()
# closing the window
cv2.destroyAllWindows() 
source.release()

但很遗憾，我不能hms与输出文件名。那可以试试你自己，如果有帮助的话这对你给予👍

实际上，你需要删除一些代码。

cv2.imshow('MultiTracker', frame)
  # quit on ESC button
  if cv2.waitKey(1) & 0xFF == 27:  # Esc pressed
    break
  # k = cv2.waitKey(1) & 0xff  
  #if k == ord('r') and recording is False:
  #  print('recording start')
  #  recording = True
  #if recording:
  result.write(frame)
  #if k == ord('e'):
  #  print('recording end')
  #  recording = False
  #  result.release()
result.release()
cv2.destroyAllWindows()
cap.release()

它对我很有效，它是6KB的原因是你开始写，但不附加帧到输出avi文件。