Question

我的目标是直播和拍摄延时照片。我一直在阅读Picamera（https://picamera.readthedocs.io/en/release-1.10/recipes2.html）文档中的“高级食谱”，以同时进行这两项操作。当我运行代码时，实时流有效，但没有图像被捕获。我不知道问题是什么。这是代码。

import datetime
import os
import time
import picamera
import io
import logging
import socketserver
from threading import Condition
from http import server

PAGE="""\
<html>
<head>
<title>Raspberry Pi - Surveillance Camera</title>
</head>
<body>
<center><h1>Raspberry Pi - Surveillance Camera</h1></center>
<center><img src="stream.mjpg" width="640" height="480"></center>
</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:
                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


def updateFileName(str_file_name,str_times):
    str_file_name = ""
    for i in range(0,6):
        if not str_file_name:
            str_file_name = str_times[0]
        else: 
            str_file_name = str(str_file_name) + "-" + str(str_times[i])  

    #print(str_file_name)
    return str_file_name

def updateTimeAndDate(str_times):

    now = datetime.datetime.now()
    str_times = [str(now.year), str(now.month), str(now.day), str(now.hour), str(now.minute), str(now.second)]

    #print(str_times)
    return str_times

str_times = []
str_file_name = ""


str_times = updateTimeAndDate(str_times)
str_file_name = updateFileName(str_file_name,str_times)
#print(str_file_name)

parent_dir =  "/home/pi/Documents/CameraStreamingProject/"
directory = str_times[0] + "/" + "NL_hydrid_1" + "/" + str_times[1] + "/" + str_times[2]


path = os.path.join(parent_dir,directory)


#initalization is over
#################################################


with picamera.PiCamera() 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')

    try:
        address = ('', 8000)
        server = StreamingServer(address, StreamingHandler)
        server.serve_forever()

        camera.iso = 700
        camera.brightness = 50
        camera.contrast = 0
        camera.sharpness = 100
        camera.shutter_speed = 8000

        for x in range(800000):

            directory = str_times[0] + "/" + "NL_hydrid_1" + "/" + str_times[1] + "/" + str_times[2]

            path = os.path.join(parent_dir,directory)

            str_times = updateTimeAndDate(str_times)
            str_file_name = updateFileName(str_file_name,str_times)

            if not os.path.exists(path):

                os.chdir(parent_dir)
                os.makedirs(directory)

            camera.resolution = (1920,1080)
            camera.start_recording(output, format='mjpeg')
            camera.wait_recording(5)
            os.chdir(path)
            camera.capture(str_file_name + ".jpg", use_video_port=True)
            camera.wait_recording(5) 
            camera.stop_recording()

    finally:
        #camera.stop_recording()
        camera.close()

在流式传输视频流时，我的屏幕快照不会保存。如何保存它们？

0 个答案: