imutils VideoStream与flask集成时返回NoneType [英] imutils VideoStream returns NoneType while integrating with flask
问题描述
因此，我想使用imutils VideoStream创建视频流并将其放在网络上.这是代码:
So i want to create a video stream using imutils VideoStream and put it on the web. This is the Code:
camera_web.py
camera_web.py
from flask import Flask, render_template, Response
from imutils.video import VideoStream
from imutils.video import FPS
import cv2
app = Flask(__name__)
vs = VideoStream(src=0).start()
@app.route('/')
def index():
""" Video streaming home page """
return render_template('index.html')
def gen():
rval, frame = vs.read()
cv2.imwrite('t.jpg', frame)
yield (b'--frame\r\n'
b'Content-Type: image/jpeg\r\n\r\n' + open('t.jpg', 'rb').read() + b'\r\n')
@app.route('/video_feed')
def video_feed():
return Response(gen(), mimetype='multipart/x-mixed-replace; boundary=frame')
if __name__ == '__main__':
app.run(host='0.0.0.0', debug = True, port = 80)
index.html
index.html
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Vehicle Counter Web</title>
</head>
<body>
<h1>Vehicle Counter Demo</h1>
<img src="{{ url_for('video_feed') }}">
</body>
</html>
现在，当我运行它时，它会返回错误:
Now when i run it, it returns the Error:
[WARN:0] videoio(MSMF):调用OnReadSample()并显示错误状态: -1072875772 [WARN:0] videoio(MSMF):异步ReadSample()调用失败，错误状态为:-1072875772 [WARN:1] videoio(MSMF):无法抓取 框架.错误:-1072875772
[ WARN:0] videoio(MSMF): OnReadSample() is called with error status: -1072875772 [ WARN:0] videoio(MSMF): async ReadSample() call is failed with error status: -1072875772 [ WARN:1] videoio(MSMF): can't grab frame. Error: -1072875772
，它不会像这张照片那样返回我的任何视频流:
and it doesn't return any of my videostream like on this picture:
我的代码中是否有错误，或者flask不支持imutils VideoStream?预先感谢.
Is there an error in my code, or does flask didn't support imutils VideoStream? Thanks in advance.
推荐答案
好的，所以我就是那个傻瓜.代码应该是这样的:
Alright, so i am the one who just dumb. The code should be like this:
camera_web.py
camera_web.py
from flask import Flask, render_template, Response
from imutils.video import WebcamVideoStream
from imutils.video import FPS
import imutils
import time
import cv2
app = Flask(__name__)
@app.route('/')
def index():
""" Video streaming home page """
return render_template('index.html')
def gen():
vs = WebcamVideoStream(src=1).start()
time.sleep(2.0)
while True:
frame = vs.read()
frame = imutils.resize(frame, width=500)
rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
cv2.imwrite('t.jpg', frame)
yield (b'--frame\r\n'
b'Content-Type: image/jpeg\r\n\r\n' + open('t.jpg', 'rb').read() + b'\r\n')
@app.route('/video_feed')
def video_feed():
return Response(gen(), mimetype='multipart/x-mixed-replace; boundary=frame')
if __name__ == '__main__':
app.run(host='0.0.0.0', debug=True, port=80)
然后我们去！我们现在应该看到视频流. 链接到图像
And there we go! we should now see the videostream. Link to the image
这篇关于imutils VideoStream与flask集成时返回NoneType的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
