最近給客戶演示程序運行結果，我就想到用Python寫一個錄屏程序，在網上能找到現成的源碼，但是它的錄屏是錄制整個屏幕的。但是在屏幕桌面下方的任務欄工具欄里有些東西，不希望被錄制到視頻里，因此需要實現一個選擇區域錄屏，就像qq截圖那樣的。我編寫的程序如下，在主函數的輸入參數里有一個選項控制是全屏錄制還是選擇區域錄制。在編寫這個程序時，我有一個疑問，在初始化寫視頻VideoWriter函數的第4個參數，它表示視頻幀的高和寬，全屏錄制方式的參數是(height,width)，選擇區域錄制的參數是(width,height)。我曾嘗試過把這個參數統一寫成(height,width)或者(width,height)。但是運行程序后，總有一種錄屏方式保存的視頻文件是無法打開的，文件大小是1kb，不知這是為何？
import cv2
from PIL import ImageGrab
import numpy as np
import argparse
import time
global img
global point1, point2
def on_mouse(event, x, y, flags, param):
global img, point1, point2
img2 = img.copy()
if event == cv2.EVENT_LBUTTONDOWN: # 左鍵點擊
point1 = (x, y)
cv2.circle(img2, point1, 10, (0, 255, 0), thickness=2)
cv2.imshow('image', img2)
elif event == cv2.EVENT_MOUSEMOVE and (flags cv2.EVENT_FLAG_LBUTTON): # 按住左鍵拖曳
cv2.rectangle(img2, point1, (x, y), (255, 0, 0), thickness=2)
cv2.imshow('image', img2)
elif event == cv2.EVENT_LBUTTONUP: # 左鍵釋放
point2 = (x, y)
cv2.rectangle(img2, point1, point2, (0, 0, 255), thickness=2)
cv2.imshow('image', img2)
def select_roi(frame):
global img, point1, point2
img = cv2.cvtColor(np.array(frame), cv2.COLOR_RGB2BGR)
winname = 'image'
cv2.namedWindow(winname, cv2.WINDOW_NORMAL)
cv2.setWindowProperty(winname, cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN)
cv2.setMouseCallback(winname, on_mouse)
cv2.imshow(winname, img)
cv2.waitKey(0)
cv2.destroyAllWindows()
return point1, point2
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('--fps', type=int, default=10, help='frame per second')
parser.add_argument('--total_time', type=int, default=15, help='video total time')
parser.add_argument('--savename', type=str, default='video.mp4', help='save file name')
parser.add_argument('--screen_type', default=1, type=int, choices=[0, 1], help='1: full screen, 0: region screen')
args = parser.parse_args()
print('等到3秒，請切換到錄屏的頁面')
if args.screen_type==0:
print('Press Esc to close window')
time.sleep(3)
curScreen = ImageGrab.grab() # 獲取屏幕對象
if args.screen_type:
height, width = curScreen.size
min_x, min_y, max_x, max_y = 0, 0, width, height
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
video = cv2.VideoWriter(args.savename, fourcc, args.fps, (height, width))
else:
point1, point2 = select_roi(curScreen)
min_x = min(point1[0], point2[0])
min_y = min(point1[1], point2[1])
max_x = max(point1[0], point2[0])
max_y = max(point1[1], point2[1])
height, width = max_y - min_y, max_x - min_x
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
video = cv2.VideoWriter(args.savename, fourcc, args.fps, (width, height))
imageNum = 0
while True:
imageNum += 1
captureImage = ImageGrab.grab() # 抓取屏幕
frame = cv2.cvtColor(np.array(captureImage), cv2.COLOR_RGB2BGR)
if args.screen_type==0:
frame = frame[min_y:max_y, min_x:max_x, :]
if imageNum args.fps * args.total_time:
video.write(frame)
# 退出條件
if cv2.waitKey(50) == ord('q') or imageNum > args.fps * args.total_time:
break
video.release()
cv2.destroyAllWindows()
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