如何解决如何将 MJPEG 流写入文件的正确方法是什么
我正在尝试同时从 RaspBerry Pi 相机流式传输和保存视频。我找到了提供流到 HTML 页面的代码，但是当我将写入输出流添加到文件时，我得到的 MJPEG 文件的大小随着时间的推移而增加，但是当我观看它时，我可以从相机看到相同的图像。我猜它只捕获了第一张图像，然后在整个视频中被卡住或复制。加上时间条坏了，我看不到当前时间或视频时长（我使用的是 VLC 播放器）。
这是代码。围绕文件（打开/写入/关闭）的所有更改都是我添加的。流媒体视频效果很好。
谢谢。
# Web streaming example
# Source code from the official PiCamera package
# http://picamera.readthedocs.io/en/latest/recipes2.html#web-streaming
import io
import picamera
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="90%" height=90%"></center>
</body>
</html>
"""
class StreamingOutput(object):
def __init__(self):
self.frame = None
self.buffer = io.BytesIO()
self.condition = Condition()
self.file = None
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.file.write(self.frame)
self.condition.notify_all()
self.buffer.seek(0)
#self.file.write(buf)
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
with picamera.PiCamera(resolution='1920x1080',framerate=30) as camera:
try:
with open("/home/pi/stream.mjpeg","wb") as outFile:
output = StreamingOutput()
output.file = outFile
camera.rotation = 180
camera.start_recording(output,format='mjpeg')
try:
address = ('',8000)
server = StreamingServer(address,StreamingHandler)
server.serve_forever()
finally:
camera.stop_recording()
finally:
outFile.close()
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