python opencv 录制视频_Python利用opencv实现录制视频

import cv2

import threading    #python 多线程操作库

class RecordingThread(threading.Thread):

def __init__(self, name, camera):

threading.Thread.__init__(self)

self.name = name

self.isRunning = True

self.cap = camera

fourcc = cv2.VideoWriter_fourcc(*'MJPG') #设置视频编码方式

self.out = cv2.VideoWriter('./images/video.avi', fourcc, 20.0, (640, 480))

# out 是VideoWriter的实列对象，就是写入视频的方式，第一个参数是存放写入视频的位置，

# 第二个是编码方式，20是帧率，最后是视频的高宽，如果录入视频为灰度，则还需加一个false

def run(self):

while self.isRunning:

ret, frame = self.cap.read()  #read()函数表示按帧读取视频，success，frame是read()的两个返回值，

# ret是布尔值——如果读取帧是正确的则返回True，如果文件读取到结尾则返回False，Frame表示的是每一帧的图像，是一个三维矩阵

if ret:

self.out.write(frame)

self.out.release()

def stop(self):

self.isRunning = False

def __del__(self):

self.out.release()

class VideoCamera(object):

def __init__(self):

# 打开摄像头， 0代表笔记本内置摄像头

self.cap = cv2.VideoCapture(0)

# 初始化视频录制环境

self.is_record = False

self.out = None

# 视频录制线程

self.recordingThread = None

# 退出程序释放摄像头

def __del__(self):

self.cap.release()

def close(self):

if self.cap.isOpened():

self.cap.release()

def start_record(self):

self.is_record = True

self.recordingThread = RecordingThread("Video Recording Thread", self.cap)

self.recordingThread.start()

def stop_record(self):

self.is_record = False

if self.recordingThread != None:

self.recordingThread.stop()

import time

camera = VideoCamera()

camera.start_record()

time.sleep(10)

camera.stop_record()