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操作系统：Mac os

开发环境：python3.7, opencv2,django

这几天正在了解用python基于django的web开发，学习新的语言或框架，第一个应用，自然是hello world，在django框架下完成一个hello world后，回想之前写过用opencv获取摄像头实时视频的例子，就想能不能把那个程序整合到现有的web中显示，经过一番折腾，终于小有成就，完成一个简单的实例。以下是主要代码：

videocapture.py   打开摄像头，并实时获取视频信息

from django.shortcuts import renderfrom django.http import HttpResponse, StreamingHttpResponseimport sysimport cv2import timeimport threadingfrom .netinfo import get_host_ipif sys.version_info.major == 2:    print('Please run this program with python3!')    sys.exit(0)def home(request):    context = {}    context["Title"] = "Video"    context["LocalIP"] = get_host_ip()    context["url"] = "http://"+get_host_ip()+":8000/getVideo"    return render(request, 'index.html',context)      debug = Truedef Camera_isOpened():    global stream, cap    cap = cv2.VideoCapture(stream) c = 80width, height = c*4, c*3width,height = 640,480resolution = str(width) + "x" + str(height)orgFrame = NoneRunning = Trueret = Falsestream = 0 #摄像头try:    Camera_isOpened()    cap = cv2.VideoCapture(stream)except:    print('Unable to detect camera! \n')    orgFrame = Noneret = FalseRunning = Truedef get_image():    global orgFrame    global ret    global Running    global stream, cap    global width, height    while True:        if Running:            try:                if cap.isOpened():                    ret, orgFrame = cap.read()                else:                    time.sleep(0.01)            except:                               cap = cv2.VideoCapture(stream)        else:            time.sleep(0.01)th1 = threading.Thread(target = get_image)th1.setDaemon(True)th1.start()def Video():    global orgFrame    while True:        if Running:            try:                if cap.isOpened():                    _ , encodedImage = cv2.imencode(".jpg",orgFrame)                    #yield(b'--frame\r\n' b'Content-Type : image/jpeg\r\n\r\n' + bytearray(encodedImage) + b'\r\n')                    yield (b'--frame\r\n'                           b'Content-Type: image/jpeg\r\n\r\n' + encodedImage.tobytes()+ b'\r\n')                else:                    time.sleep(0.01)            except:                               time.sleep(0.01)                print("Exception")        else:            time.sleep(0.01)def getVideo(request):    return StreamingHttpResponse(Video(),content_type='multipart/x-mixed-replace; boundary=frame')

netinfo.py 获取IP地址

import socketdef get_host_ip():    """    查询本机ip地址    :return:    """    try:        s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)        s.connect(('8.8.8.8',80))        ip=s.getsockname()[0]    finally:        s.close()    return ip

index.html 模板页，用于显示视频

{
  {Title}}
Local IP:{
  {LocalIP}}

urls.py中的配置

from django.contrib import adminfrom django.urls import pathfrom views import videocaptureurlpatterns = [    path('',videocapture.home),    path('getVideo',videocapture.getVideo)]

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