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• matroskadec : Add support for parsing live header files

  1er avril 2015, par Vignesh Venkatasubramanian

  matroskadec : Add support for parsing live header files
  This patch adds support for parsing live files (produced by
  
   f webm_chunk) which contains only the headers but no packets. This
  
  is only used when using -f webm_dash_manifest. There will be a
  
  follow up patch which adds live support to WebM DASH Manifest
  
  muxer.
  Signed-off-by : Vignesh Venkatasubramanian <vigneshv@google.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/matroskadec.c

• Live stream is gets delayed while processing frame in opencv + python

  18 mars 2021, par Himanshu sharma

  I capture and process an IP camera RTSP stream in a OpenCV 4.4.0.46 on Ubuntu.
Unfortunately the processing takes quite a lot of time, roughly 0.2s per frame, and the stream quickly gets delayed.
Video file have to save for 5 min but by this delaying video file is saved for 3-4 min only.

  


  Can we process faster to overcome delays ?

  


  I have two IP camera which have two diffrent fps_rate(Camera 1 have 18000 and camera 2 have 20 fps)

  


  I am implementing this code in difference Ubuntu PCs

  


  

  • Python 3.8.5 (default, Jul 28 2020, 12:59:40) [GCC 9.3.0] on linux

  


  • Django==3.1.2

  


  • Ubuntu = 18.04 and 20.04

  


  • opencv-contrib-python==4.4.0.46

  


  • opencv-python==4.4.0.46

  


  


  input_stream = 'rtsp://'+username+':'+password+'@'+ip+'/user='+username+'_password='+password+'_channel=0channel_number_stream=0.sdp'
input_stream---> rtsp://admin:Admin123@192.168.1.208/user=admin_password=Admin123_channel=0channel_number_stream=0.sdp

input_stream---> rtsp://Admin:@192.168.1.209/user=Admin_password=_channel=0channel_number_stream=0.sdp

vs = cv2.VideoCapture(input_stream)
fps_rate = int(vs.get(cv2.CAP_PROP_FPS))
I have two IP camera which have two diffrent fps_rate(Camera 1 have 18000 and camera 2 have 20 fps)

video_file_name = 0
start_time = time.time()
while(True):
    ret, frame = vs.read()
    time.sleep(0.2)     # <= Simulate processing time (mask detection, face detection and many detection is hapning)


    ###  Start of  writing a video to disk          
    minute = 5  ## saving a file for 5 minute only then saving another file for 5 min
    second  = 60
    minite_to_save_video = int(minute) * int(second)


    # if we are supposed to be writing a video to disk, initialize
    if time.time() - start_time >= minite_to_save_video or  video_file_name == 0 :
        ## where H = heigth, W = width, C = channel 
        H, W, C = frame.shape
        
        print('time.time()-->',time.time(),'video_file_name-->', video_file_name,  ' #####')
        start_time = time.time()

        video_file_name = str(time.mktime(datetime.datetime.now().timetuple())).replace('.0', '')
        output_save_directory = output_stream+str(int(video_file_name))+'.mp4'


        fourcc = cv2.VideoWriter_fourcc(*'avc1')
        
        writer = cv2.VideoWriter(output_save_directory, fourcc,20.0,(W, H), True)

    # check to see if we should write the frame to disk
    if writer is not None:
        
        try:
            writer.write(frame)

        except Exception as e:
            print('Error in writing video output---> ', e)


  


• How to Configure nginx with stunnel to accept parameters for different FB Live Streams OR rtmps with FFMPEG

  15 septembre 2020, par Yogesh Agarwal

  I want to setup RTMPS and learned that only way around is by using nginx and stunnel. I have the setup and it works with just one configured key.

  



  I have several different keys and all are dynamic. A lot of different urls too.

  



  My Goal is to add a parameter or some way by which i can send the custom url to nginx and it can send to Stunnel, and it can read the custom url and forward the encrypted stream to that url.

  



  I am able to get everything done right via ngnix and stunnel but with preconfigured key only - But i want Dynamic key here.. just like a parameter where you can simply plug and send the stream.

  



  I even tried to set this way.

  



  push rtmp ://127.0.0.1:19350/rtmp/ ;

  



  so i can simple forward the stream to rtmp ://127.0.0.1:19350/rtmp/my-key and it takes my-key and forward the stream via stunnel to facebook. but i cannot get it work.

  



  I am about to bang my heads in walls. Kindly give me some pointers.. I am not sure how to do it via ffmpeg as it says it cannot find rtmps protocol.

  



  My Nginx Config :

  



  # RTMP configuration
rtmp {
    server {
        listen 1935; # Listen on standard RTMP port
        chunk_size 4000;
 # This application is to accept incoming stream
        application live {


                live on; # Allows live input from above
                exec_push rtmp://127.0.0.1:19350/rtmp/$name;
                allow play 127.0.0.1;
                dash on;
                dash_path /var/tmp/dashme;

                hls on; # Enable HTTP Live Streaming
                hls_cleanup on;
                hls_sync 100ms;
                hls_fragment 2s;
                hls_path /var/tmp/live/;


        }


  



  and My Stunnel Config :

  



  setuid = nobody
setgid = nobody
pid=/tmp/stunnel.pid
output = /var/log/stunnel.log
;include = /etc/stunnel/conf.d

[fb-live]
client = yes
accept = 127.0.0.1:19350
connect = live-api-s.facebook.com:443
;verifyChain = no