python imutils VideoStream在与flask集成时返回NoneType

pcrecxhr  于 2023-05-05  发布在  Python
关注(0)|答案(1)|浏览(89)

所以我想用imutils VideoStream创建一个视频流,并把它放在网上。这是代码:
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

<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,它返回错误:
[ WARN:0] videoio(MSMF):调用OnReadSample()时,状态为错误:-1072875772 [ WARN:0] videoio(MSMF):async ReadSample()调用失败,错误状态为:-1072875772 [ WARN:1] videoio(MSMF):无法抓取帧。联系电话:021 - 88888888
它不会返回任何我的视频流,就像这张图片一样:

是我的代码出错了,还是flask不支持imutils VideoStream?先谢谢你了。

3phpmpom

3phpmpom1#

好吧,我就是那个愚蠢的人。代码应该是这样的:
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)

好了我们现在应该看到视频流。Link to the image

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