我正在尝试使用 opencv 写入方法保存视频，但视频保存为 0 kb。我的代码出了什么问题。
import cv2
cap = cv2.VideoCapture("k1.mp4")
# assert cap.isOpened()
fgbg = cv2.bgsegm.createBackgroundSubtractorMOG()
fourcc = cv2.VideoWriter_fourcc(*'MP42')
out = cv2.VideoWriter('output.mp4', fourcc, 20.0, (640,480))
# assert out.isOpened()
while cap.isOpened():
ret, frame = cap.read()
# if not ret: break
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
fgmask = fgbg.apply(gray)
thresh = 2
maxValue = 255
ret, th1 = cv2.threshold(fgmask, thresh, maxValue, cv2.THRESH_BINARY)
color_space = cv2.applyColorMap(th1, cv2.COLORMAP_JET)
result_vid = cv2.addWeighted(frame, 0.7, color_space, 0.7, 0)
out.write(result_vid)
cv2.imshow("vid", result_vid)
if cv2.waitKey(20) == ord('q'):
break
cap.release()
out.release() …