包装成函数，凑代码量

MV.py

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+import cv2 as cv
+import numpy as np
+cap = cv.VideoCapture("./vid/zootopia.mkv")
+ret, frame1 = cap.read()
+prvs = cv.cvtColor(frame1,cv.COLOR_BGR2GRAY)
+hsv = np.zeros_like(frame1)
+hsv[...,1] = 255
+print("read")
+cap.set(cv.CAP_PROP_POS_FRAMES,59760)
+print("read done")
+while(1):
+    for i in range(1,12):
+        cap.read()
+    ret, frame2 = cap.read()
+    next = cv.cvtColor(frame2,cv.COLOR_BGR2GRAY)
+    flow = cv.calcOpticalFlowFarneback(prvs,next, None, 0.5, 3, 15, 3, 5, 1.2, 0)
+    mag, ang = cv.cartToPolar(flow[...,0], flow[...,1])
+    hsv[...,0] = ang*180/np.pi/2
+    hsv[...,2] = cv.normalize(mag,None,0,255,cv.NORM_MINMAX)
+    bgr = cv.cvtColor(hsv,cv.COLOR_HSV2BGR)
+    cv.namedWindow("frame2", cv.WINDOW_NORMAL)
+    cv.namedWindow("frame", cv.WINDOW_NORMAL)
+    cv.imshow('frame2',bgr)
+    cv.imshow("frame",frame2)
+    cv.waitKey(1)
+    #k = cv.waitKey(0.1) & 0xff
+    #if k == 27:
+    #    break
+    #elif k == ord('s'):
+    #    cv.imwrite('opticalfb.png',frame2)
+    #    cv.imwrite('opticalhsv.png',bgr)
+    prvs = next
+cap.release()
+cv.destroyAllWindows()