opencv調用攝像頭保存視頻

---

保存視頻（采用默認分辨率640 x 480)

import cv2
import time
# 定義視頻捕捉對象
cap = cv2.VideoCapture(1)  # 參數0代表計算機的默認攝像頭# 獲取視頻的寬度和高度
frame_width = int(cap.get(3))
frame_height = int(cap.get(4))
# 定義VideoWriter對象并初始
out = cv2.VideoWriter('C:/Users/Desktop/0527.mp4',cv2.VideoWriter_fourcc(*'mp4v'), 20.0, (frame_width, frame_height))while(cap.isOpened()):ret, frame = cap.read()  # 讀取if ret:cv2.imshow('frame', frame)       # 寫入幀到輸出視頻文件out.write(frame)           if cv2.waitKey(1) & 0xFF == ord('q'):breakelse:break 
# 釋放資源
cap.release()
out.release()
cv2.destroyAllWindows()

保存視頻（指定分辨率，例1280×720)

初始化與保存幀大小一致

import cv2
import time
# 定義視頻捕捉對象
cap = cv2.VideoCapture(1)  # 參數0代表計算機的默認攝像頭# 獲取視頻的寬度和高度
frame_width = 1280
frame_height =720
# 定義VideoWriter對象并初始
out = cv2.VideoWriter('C:/Users/Desktop/0527.mp4',cv2.VideoWriter_fourcc(*'mp4v'), 20.0, (frame_width, frame_height))while(cap.isOpened()):ret, frame = cap.read()  # 讀取if ret:frame_resize=cv2.resize(frame,(1280,720))cv2.imshow('frame', frame)       # 寫入幀到輸出視頻文件out.write(frame_resize)           if cv2.waitKey(1) & 0xFF == ord('q'):breakelse:break 
# 釋放資源
cap.release()
out.release()
cv2.destroyAllWindows()