python - 在python中从jpeg图像创建mjpeg流

我需要提供实时图形，并且我想通过http传递一个mjpeg流(以便通过使用普通标签将图形轻松地包含在网页中)。

是否可以从多个jpeg图像实时创建一个mjpeg流？

我的策略是:

输出正确的http header :

Cache-Control:no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0
Connection:close
Content-Type:multipart/x-mixed-replace;boundary=boundarydonotcross
Expires:Mon, 3 Jan 2000 12:34:56 GMT
Pragma:no-cache
Server:MJPG-Streamer/0.2

(是从curl -I {on a mjpeg-streamer instance}获得的，但这似乎很奇怪)

只需生成连续的jp​​eg图像二进制文件，请注意以下几点:

在流的开头添加正确的 header (如mjpeg-streamer一样):

Content-Type: image/jpeg
Content-Length: 5427
X-Timestamp: 3927662.086099

在每个jpeg流的末尾附加边界字符串。

--boudary--

问题:

你做完了吗

您知道执行此操作的python模块吗？

你认为这行得通吗

你有什么建议吗？

最佳答案

我将其用作概念验证:https://github.com/damiencorpataux/pymjpeg

对于内存:

import os, time
from glob import glob
import sys
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler

boundary = '--boundarydonotcross'

def request_headers():
    return {
        'Cache-Control': 'no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0',
        'Connection': 'close',
        'Content-Type': 'multipart/x-mixed-replace;boundary=%s' % boundary,
        'Expires': 'Mon, 3 Jan 2000 12:34:56 GMT',
        'Pragma': 'no-cache',
    }

def image_headers(filename):
    return {
        'X-Timestamp': time.time(),
        'Content-Length': os.path.getsize(filename),
        #FIXME: mime-type must be set according file content
        'Content-Type': 'image/jpeg',
    }

# FIXME: should take a binary stream
def image(filename):
    with open(filename, "rb") as f:
        # for byte in f.read(1) while/if byte ?
        byte = f.read(1)
        while byte:
            yield byte
            # Next byte
            byte = f.read(1)

# Basic HTTP server
class MyHandler(BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        # Response headers (multipart)
        for k, v in pymjpeg.request_headers().items():
            self.send_header(k, v)
        # Multipart content
        for filename in glob('img/*'):
            # Part boundary string
            self.end_headers()
            self.wfile.write(pymjpeg.boundary)
            self.end_headers()
            # Part headers
            for k, v in pymjpeg.image_headers(filename).items():
                self.send_header(k, v)
            self.end_headers()
            # Part binary
            for chunk in pymjpeg.image(filename):
                self.wfile.write(chunk)
    def log_message(self, format, *args):
        return

httpd = HTTPServer(('', 8001), MyHandler)
httpd.serve_forever()

关于python - 在python中从jpeg图像创建mjpeg流，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21197638/