Python3 PiCamera 模块

Question

我有一个带相机（黑色）的 Raspberry Pi 3，我在 python 上找到了这个 pi 相机模块。因此，当我启动 python 脚本时，我现在有了一个 Web 服务器，它允许我看到我的相机。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，实际上是在/home/pi/x
停止视频，实际上只停止录制而不是整个流。

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

我可能会使用 Flask 来设置服务器，而不是使用 php 的基本 HTTPServer。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，甚至可能无法工作。

This Hackster project 可能是使用 Flask 进行流式传输的一个很好的起点。对于 start/stop 视频，一种（粗略的）可能性是在 start_video 和 stop_video 内部切换一个变量，并控制视频是 returns 图像还是没有。

为了在通过网络服务器流式传输视频的同时录制视频，this 可能会有用。

Python3 PiCamera 模块

Python3 PiCamera Module

python

camera

raspberry-pi

picamera