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• Processing Camera stream in Opencv, pushing it over RTMP (NGINX RTMP Module) using FFMPEG

  12 août 2019, par Asymptote

  Output video :
  https://youtu.be/VxfoBQjoY6E

  Explanation :

  I want to : Process camera stream in Opencv and push it over to RTMP server. I already have NGINX (RTMP module) set up and I have tested streaming videos with both RTMP (Flash Player) and HLS.

  I am reading the frames in a loop and using ’subprocess’ in python to execute ffmpeg command. Here’s the command I am using :

  command = [ffmpeg,
  
      '-y',
  
      '-f', 'rawvideo',
  
      '-vcodec','rawvideo',
  
      '-pix_fmt', 'bgr24',
  
      '-s', dimension,
  
      '-i', '-',
  
      '-c:v', 'libx264',
  
      '-pix_fmt', 'yuv420p',
  
      '-preset', 'ultrafast',
  
      '-f', 'flv',
  
      'rtmp://10.10.10.80/live/mystream']
  
  
  
  
  
  import subprocess as sp
  
  ...
  
  proc = sp.Popen(command, stdin=sp.PIPE,shell=False)
  
  ...
  
  proc.stdin.write(frame.tostring()) #frame is read using opencv

  Problem :

  I can see the stream fine but it freezes and resumes frequently. Here’s the output of FFMPEG terminal log :

  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  frame=  117 fps= 16 q=22.0 size=     344kB time=00:00:04.04 bitrate= 697.8kbits/s speed=0.543x   

  It mentions speed at the end. I believe it should be close to 1x. I am not sure how to achieve that.

  And I am on the same network as server, I can post my python code if required. Need some ffmpeg guru to give me some advise.

  EDIT

  My input fps is actually 3.
  With '-use_wallclock_as_timestamps', '1' I can see in the log that speed is close to 1x.
  But HLS is not streaming live there’s 2 min delay, it halts and . Chris’s advise partially worked. I am not sure where exactly is the problem, I am starting to believe it has something to do with nginx-rtmp module.

  Here’s the final output, on left it’s flash and on right it’s hls. I am showing the ffmpeg options at the end.
  https://youtu.be/jsm6XNFOUE4

• nginx.conf with RTMP module : Add watermark on MULTIPLE video streams withh ffmpeg

  16 mai 2023, par Frederick Eyland

  I need to add a watermark in nginx.conf on all my output streams. This is what I found from the documentation from ffmpeg but it is not working.

  



  exec ffmpeg -i rtmp://localhost/$app/$name -i /mnt/pictures/flowtech.png -filter_complex "overlay=10:10,split=5[out1][out2][out3][out4][out5]"
-map '[out1]' -map 0:a -c:v libx264 -c:a aac -ac 1 -strict -2 -b:v 256k -b:a 32k -vf "scale=480:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://localhost/hlsall/$name_low
-map '[out2]' -map 0:a -c:v libx264 -c:a aac -ac 1 -strict -2 -b:v 768k -b:a 96k -vf "scale=720:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://localhost/hlsall/$name_mid
-map '[out3]' -map 0:a -c:v libx264 -c:a aac -ac 1 -strict -2 -b:v 1024k -b:a 128k -vf "scale=960:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://localhost/hlsall/$name_high
-map '[out4]' -map 0:a -c:v libx264 -c:a aac -ac 1 -strict -2 -b:v 1920k -b:a 128k -vf "scale=1280:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://localhost/hlsall/$name_hd720
-map '[out5]' -map 0:a -c copy -f flv rtmp://localhost/hlsall/$name_src 1>>/tmp/rtmp_log;


  


• Adds dnn inference module for simple convolutional networks. Reimplements srcnn filte...

  25 mai 2018, par Sergey Lavrushkin

  Adds dnn inference module for simple convolutional networks. Reimplements srcnn filter based on it.
  Signed-off-by : Pedro Arthur <bygrandao@gmail.com>
  

  • [DH] Changelog
  • [DH] libavfilter/Makefile
  • [DH] libavfilter/dnn_backend_native.c
  • [DH] libavfilter/dnn_backend_native.h
  • [DH] libavfilter/dnn_interface.c
  • [DH] libavfilter/dnn_interface.h
  • [DH] libavfilter/dnn_srcnn.h
  • [DH] libavfilter/vf_srcnn.c
  • [DH] libavfilter/vf_srcnn.h