我想把屏幕的一部分保存为视频。当运行下面的代码时,我可以看到窗口和fps计数(大约100-140 fps)。在
import numpy as np
import cv2
import time
import mss
frame_width = 1280
frame_height = 720
frame_rate = 20.0
PATH_TO_MIDDLE = "output.avi"
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter(PATH_TO_MIDDLE, fourcc, frame_rate,
(frame_width, frame_height))
with mss.mss() as sct:
# Part of the screen to capture
monitor = {"top": 120, "left": 280, "width": 1368, "height": 770}
while "Screen capturing":
last_time = time.time()
# Get raw pixels from the screen, save it to a Numpy array
img = np.array(sct.grab(monitor))
img = cv2.resize(img, (1280, 720))
frame = img
cv2.putText(frame, "FPS: %f" % (1.0 / (time.time() - last_time)),
(10, 10), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 2)
out.write(frame)
cv2.imshow('frame', frame)
# Press "q" to quit
if cv2.waitKey(25) & 0xFF == ord("q"):
break
# Clean up
out.release()
cv2.destroyAllWindows()
这段代码没有产生任何错误,所以我不明白这里出了什么问题。输出文件output.avi
创建良好,但大小为5.7kb(这个文件我没有打开)。我尝试改变VideoWriter
,在while
内移动out
和{frame_rate
,并将framewidth
和{
在
frame = img
后面添加这两行有助于:可能
opencv
不能将图像另存为np.array
,所以这里需要使用cv2.cvtColor
。在相关问题 更多 >
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