0

所以我想使用 imutils VideoStream 创建一个视频流并将其放在网络上。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)

索引.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): OnReadSample() 被调用，错误状态：-1072875772 [WARN:0] videoio(MSMF): async ReadSample() 调用失败，错误状态：-1072875772 [WARN:1] videoio (MSMF)：无法抓取帧。错误：-1072875772

它不会像这张照片一样返回我的任何视频流：

在此处输入图像描述

我的代码有错误，还是烧瓶不支持 imutils VideoStream？提前致谢。

4

1 回答 1

3

好吧，所以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)

我们去吧！我们现在应该看到视频流。 链接到图片

于 2019-03-25T10:21:23.530 回答