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• How to use the video datastreaming I get from nginx server ?

  31 janvier, par Jennie Tsai

  I have three nodes in my network :
dataServer --- node1 --- node2.
My video data "friends.mp4" is saved on dataServer. I started both dataServer and node2 as rtmp-nginx servers. I use ffmpeg on node1 to pull datastreaming on dataServerand and push the converted datastreaming to the application "live" on node2.
Here's my configuration of nginx.conf for node2.

  


  worker_processes  1;
events {
    worker_connections  1024;
}

rtmp {
    server {

    listen 1935;

    chunk_size 4000;

application play {
        play /usr/local/nginx/html/play;
    }

application hls {
        live on;
        hls on;
        hls_path /usr/local/nginx/html/hls;
    hls_fragment 1s;
    hls_playlist_length 4s;
    }

application live  
    {
        live on; 
    allow play all;
    }
}
}


  


  I want to run this python code to recognize the faces in friends.mp4 :

  


  import cv2

vid_capture=cv2.VideoCapture("rtmp://127.0.0.1:1935/live")
face_detect = cv2.CascadeClassifier('./haarcascade_frontalface_default.xml')
if (vid_capture.isOpened() == False):
    print("Error opening the video file")
else:
    fps = vid_capture.get(5)
    print("Frames per second : ", fps,'FPS')
    frame_count = vid_capture.get(7)
    print('Frame count : ', frame_count)

while(vid_capture.isOpened()):
    ret, frame = vid_capture.read()
    if ret == True:
        gray = cv2.cvtColor(frame, code=cv2.COLOR_BGR2GRAY)
        face_zone = face_detect.detectMultiScale(gray, scaleFactor=1.1, minNeighbors=3)
        for x, y, w, h in face_zone:
            cv2.rectangle(frame, pt1 = (x, y), pt2 = (x+w, y+h), color = [0,0,255], thickness=2)
            cv2.circle(frame, center = (x + w//2, y + h//2), radius = w//2, color = [0,255,0], thickness = 2)
        cv2.imshow('Frame', frame)
        key = cv2.waitKey(50)
        if key == ord('q'):
            break
    else:
        break
vid_capture.release()
cv2.destoryAllWindows()


  


  But I can't do it because cv2.VideoCapture can not get the data streaming from rtmp://127.0.0.1:1935/live. Maybe it is because this path is not a file. How can I get the video streaming received by the nginx server and put it to my openCV model ? Is there a way that I just access the dataStreaming received by the nginx server and make it a python object that openCV can use ?

  


• I am trying to extract video file using below code i'm getting an 500 internal server error ?

  17 octobre 2014, par Ramesh

  The problem is that I get a "500 internal server error" the first time I execute the script, but it works as I expect if I reload the page.

  I am using below code.

  exec(FFMPEG_PATH." -i $uploadedfile  -vcodec copy -acodec copy  $path/webservice/ovideos/$thumb_name.mp4 > ".NULL_FILE);
  
  
  
  exec(FFMPEG_PATH."  -itsoffset $jpegFrameTime  -i  $path/webservice/ovideos/$thumb_name.mp4 -vcodec mjpeg -vframes 1 -an -f rawvideo -s 120x110 $path/webservice/images/thumbs/$thumb_name.jpg > ".NULL_FILE);

• Http server live streaming in python

  8 juillet 2015, par George Subi

  I want to send the live output of ffmpeg command to every GET request, but I’m novice in python and can’t solve it. This is my code :

  import subprocess # for piping
  
  from http.server import HTTPServer, BaseHTTPRequestHandler
  
  
  
  class RequestHandler(BaseHTTPRequestHandler):
  
  
  
      def _writeheaders(self):
  
          self.send_response(200) # 200 OK http response
  
          self.send_header('Connection', 'keep-alive')
  
          self.send_header('Content-Type', 'video/mp4')
  
          self.send_header('Accept-Ranges', 'bytes')
  
          self.end_headers()
  
  
  
      def do_GET(self):
  
          self._writeheaders()
  
          global p
  
          DataChunkSize = 10000
  
  
  
          print("starting polling loop.")
  
          while(p.poll() is None):
  
              print("looping... ")
  
              stdoutdata = p.stdout.read(DataChunkSize)
  
              self.wfile.write(stdoutdata)
  
  
  
          print("Done Looping")
  
  
  
          print("dumping last data, if any")
  
          stdoutdata = p.stdout.read(DataChunkSize)
  
          self.wfile.write(stdoutdata)
  
  
  
  if __name__ == '__main__':
  
      command = 'ffmpeg -re -i video.avi -an -vcodec libx264 -vb 448k -f mp4 -movflags dash -'
  
      print("running command: %s" % (command, ))
  
      p = subprocess.Popen(command, stdout=subprocess.PIPE, bufsize=-1, shell=True)
  
      print("Server in port 8080...")
  
      serveraddr = ('', 8080) # connect to port 8080
  
      srvr = HTTPServer(serveraddr, RequestHandler)
  
      srvr.serve_forever()

  This is a prove of concept with a video.avi but the real application is with a live signal video.

  When connect to html5 video tag, play the video well, but when open another connection then play the video from the begining and not from the live moment. Also, when close the web, the server print an error :

  BrokenPipeError: [Errno 32] Broken pipe

  Yes, the pipe is broken when cut the connection is obvious. I think that maybe do it with pipes is not correct, but I don’t know how to do it.

  The goal is to run only one ffmpeg command and the output send to every client connected or will do it. Anybody can help me please ?