Python MJPEG服務器

我正在嘗試對樹莓派進行視覺處理，並監視圖形界面上的效果。使用cv2.imshow確實會降低幀速率，所以我嘗試將操作流式傳輸到MPEG本地服務器，然後從另一臺桌面上的chrome監視它。下面是我開發的代碼：Python MJPEG服務器

from http.server import BaseHTTPRequestHandler, HTTPServer 
from socketserver import ThreadingMixIn 
from threading import Thread 
import imutils 
import sys 

class CamHandler(BaseHTTPRequestHandler): 
    def do_GET(self): 
     print(self.path) 
     if self.path.endswith('/stream.mjpg'): 
      self.send_response(20) 
      self.send_header('Content-type', 'multipart/x-mixed-replace; boundary=--jpgboundary') 
      self.end_headers() 
      while True: 
       try: 

        if(frame != None): 
         pass 
        r, buf = cv2.imencode(".jpg", frame) 
        self.wfile.write("--jpgboundary\r\n".encode()) 
        self.end_headers() 
        self.wfile.write(bytearray(buf)) 
       except KeyboardInterrupt: 
        break 
      return 

     if self.path.endswith('.html') or self.path == "/": 
      self.send_response(200) 
      self.send_header('Content-type', 'text/html') 
      self.end_headers() 
      self.wfile.write('<html><head></head><body>') 
      self.wfile.write('<img src="http://localhost:9090/stream.mjpg" height="240px" width="320px"/>') 
      self.wfile.write('</body></html>') 
      return 

class ThreadedHTTPServer(ThreadingMixIn, HTTPServer): 
    """Handle requests in a separate thread.""" 


class WebcamVideoStream: 
    def __init__(self, src=0): 
     # initialize the video camera stream and read the first frame 
     # from the stream 
     self.stream = cv2.VideoCapture(src) 
     # self.stream.set(3, 1920) 
     # self.stream.set(4, 1080) 
     # self.stream.set(15,-100) 
     (self.grabbed, self.frame) = self.stream.read() 

     # initialize the variable used to indicate if the thread should 
     # be stopped 
     self.stopped = False 

    def start(self): 
     # start the thread to read frames from the video stream 
     Thread(target=self.update, args=()).start() 
     return self 

    def update(self): 
     # keep looping infinitely until the thread is stopped 
     while True: 
      # if the thread indicator variable is set, stop the thread 
      if self.stopped: 
       self.stream.release() 
       return 

      # otherwise, read the next frame from the stream 
      (self.grabbed, self.frame) = self.stream.read() 

    def read(self): 
     # return the frame most recently read 
     return self.frame 

    def stop(self): 
     # indicate that the thread should be stopped 
     self.stopped = True 


def realmain(): 
    global frame 

    ip = 'localhost' 

    try: 
     cap = WebcamVideoStream().start() 
     server = ThreadedHTTPServer((ip, 9090), CamHandler) 
     print("starting server") 
     target = Thread(target=server.serve_forever,args=()) 

     i = 0 
     while True: 

      img = cap.read() 
      img1 = imutils.resize(img, width=600) 
      img2 = cv2.GaussianBlur(img1, (5, 5), 0) 
      #frame = cv2.cvtColor(img2, cv2.COLOR_BGR2HSV) 

      frame = cv2.Canny(img, 35, 125) 
      if(i == 0): 
       target.start() 
      i +=1 

    except KeyboardInterrupt: 
     sys.exit() 

if __name__ == '__main__': 
    realmain()

現在，我可以從我的桌面上運行的服務器和查看MPEG的從我的桌面上的鍍鉻細，但我無法從我的覆盆子PI運行服務器，並通過在我的桌面上輸入以下URL：http：//「RASPBERRY PI IP」：9090/stream.mjpg來訪問它。當我這樣做時，Chrome只是說網頁不可用。即使在PI上運行服務器，我也無法查看Epiphany瀏覽器上的網址，它只是下載圖像。想知道如果有人有這個問題的答案。

另外，有沒有更快的方式來解壓縮和重新壓縮之前發送到服務器的JPG？

來源

2017-02-03 Sachin Konan

你可以試試* ip =「」*（空字符串）而不是*'localhost'*嗎？ – sal

謝謝，我其實嘗試了我的手機wifi熱點上的服務器，並且能夠通過我的桌面進行連接。必須有防火牆阻止連接 –

您綁定到服務器爲localhost：

ip = 'localhost' 

try: 
    cap = WebcamVideoStream().start() 
    server = ThreadedHTTPServer((ip, 9090), CamHandler)

嘗試改變'localhost'到'0.0.0.0'。它會將服務器綁定到所有網絡接口。

來源

2017-08-14 06:56:34 utapyngo

Python MJPEG服務器

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