Python3 PiCamera 模块

Question

I have a Raspberry Pi 3 with a Camera (Noir) and I found on python this pi camera module.我有一个带摄像头（Noir）的 Raspberry Pi 3，我在 python 上找到了这个 pi 摄像头模块。 So I have now when I am starting the python script a Webserver which allows me to see throw my camera.所以我现在在启动 python 脚本时有一个网络服务器，它允许我看到我的相机。 Thats fine and cool, but now I wanted to make with some php and html a form with two buttons:那很好很酷，但现在我想用一些 php 和 html 制作一个带有两个按钮的表单：

Start Video, actually starts video to record somewhere at /home/pi/x Start Video，实际上是在 /home/pi/x 某处开始录制视频
Stop Video , which actually stops only the recording and not the whole stream. Stop Video ，它实际上只停止录制而不是整个流。

Heres my code这是我的代码

import io
import picamera
import logging
import socketserver
from threading import Condition
from http import server

PAGE="""\
<?php 
    if(isset($_POST['submit'])){ 
         //code to be executed
        shell_exec("./start_video.sh");
    }else{
         //code to be executed
    }
   if(isset($_POST['submit2'])){
       shell_exec("./stop_video.sh");
   }else{

   }
?>
<html>
<head>
<title>Raspberry Pi - Surveillance Camera</title>
</head>
<body>

<center><h1>Raspberry Pi - Surveillance Camera</h1></center>
<center><img src="stream.mjpg" width="1280" height="720"></center>

<form method="post" action="">
        <input type="submit" name="submit" value="Start Video">
       <input type="submit" name="submit2" value="Stop Video">     
</form>

</body>
</html>
"""

class StreamingOutput(object):
    def __init__(self):
        self.frame = None
        self.buffer = io.BytesIO()
        self.condition = Condition()

    def write(self, buf):
        if buf.startswith(b'\xff\xd8'):
            # New frame, copy the existing buffer's content and notify all
            # clients it's available
            self.buffer.truncate()
            with self.condition:
                self.frame = self.buffer.getvalue()
                self.condition.notify_all()
            self.buffer.seek(0)
        return self.buffer.write(buf)

class StreamingHandler(server.BaseHTTPRequestHandler):
    def do_GET(self):
        if self.path == '/':
            self.send_response(301)
            self.send_header('Location', '/index.html')
            self.end_headers()
        elif self.path == '/index.html':
            content = PAGE.encode('utf-8')
            self.send_response(200)
            self.send_header('Content-Type', 'text/html')
            self.send_header('Content-Length', len(content))
            self.end_headers()
            self.wfile.write(content)
        elif self.path == '/stream.mjpg':
            self.send_response(200)
            self.send_header('Age', 0)
            self.send_header('Cache-Control', 'no-cache, private')
            self.send_header('Pragma', 'no-cache')
            self.send_header('Content-Type', 'multipart/x-mixed-replace; boundary=FRAME')
            self.end_headers()
            try:
         try:
                while True:
                    with output.condition:
                        output.condition.wait()
                        frame = output.frame
                    self.wfile.write(b'--FRAME\r\n')
                    self.send_header('Content-Type', 'image/jpeg')
                    self.send_header('Content-Length', len(frame))
                    self.end_headers()
                    self.wfile.write(frame)
                    self.wfile.write(b'\r\n')
            except Exception as e:
                logging.warning(
                    'Removed streaming client %s: %s',
                    self.client_address, str(e))
        else:
            self.send_error(404)
            self.end_headers()

class StreamingServer(socketserver.ThreadingMixIn, server.HTTPServer):
    allow_reuse_address = True
    daemon_threads = True

with picamera.PiCamera(resolution='1280x720', framerate=30) as camera:
    output = StreamingOutput()
    #Uncomment the next line to change your Pi's Camera rotation (in degrees)
    #camera.rotation = 90
    camera.start_recording(output, format='mjpeg')
        address = ('', 8000)
        server = StreamingServer(address, StreamingHandler)
        server.serve_forever()
    finally:
        camera.stop_recording()

Answer 1

I would probably use Flask to setup the server instead of a basic HTTPServer with php.我可能会使用Flask来设置服务器，而不是使用 php 的基本 HTTPServer。 Using shell scripts that get called via php and control stuff inside the server is not very elegant and might not even work.使用通过 php 调用的 shell 脚本并控制服务器内部的东西不是很优雅，甚至可能不起作用。

This Hackster project might be a good starting point for streaming with flask. 这个 Hackster 项目可能是使用Flask进行流式传输的一个很好的起点。 To start/stop the video, one (crude) possibility could be to have a variable that gets toggled inside start_video and stop_video routes and controls whether the video feed returns an image or not.要开始/停止视频，一种（粗略的）可能性可能是在start_video和stop_video路由中切换一个变量，并控制视频源是否返回图像。

In order to record video at the same time as streaming it through the webserver, this might be useful.为了在通过网络服务器流式传输视频的同时录制视频，这可能很有用。

Python3 PiCamera 模块

问题描述

1 个解决方案

解决方案1
1 2021-06-28 12:20:15

Python3 PiCamera 模块

问题描述

1 个解决方案

解决方案1 1 2021-06-28 12:20:15

解决方案1
1 2021-06-28 12:20:15