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• Can NGINX RTMP code be modified to split audio from video without FFMPEG ?

  19 novembre 2022, par Nav

  I have an NGINX RTMP server running, which uses an exec ffmpeg command to extract audio from a video call, and then stream the audio to a server.

  


  Problem :

  


  

  1. There's a delay of few seconds.

  


  2. It consumes extra CPU, becoming costly.

  


  


  Is there a way I can modify the NGINX RTMP code to directly extract audio and stream it to a server ? I did see that NGINX has mux and demux capability. Alternatively, any other C++ or C program would do.

  


  addendum : I tried using OBS to stream a video and used NGINX RTMP with exec ffmpeg to extract audio. Approximately 30% of CPU was consumed. Then, while OBS continued to do the streaming, I stopped NGINX sudo /usr/local/nginx/sbin/nginx -s quit, and there was almost no drop in CPU usage. Does this mean that it would be a wasted effort to try to modify the RTMP code to reduce CPU consumption ?

  


• Returned non-zero exit status 1 / error code 1 : b''

  26 août 2015, par pufAmuf

  I’m trying to extract the video height via ffprobe into python, however I am having issues (with some videos).

  Here is my ffprobe command : ffprobe -v quiet -print_format compact=print_section=0:nokey=1:escape=csv -show_entries stream=height "some video here(bla)_25.mp4"

  It returns something like this

  720
  
  (empty-line)
  
  N/A

  Here is the code I used to extract the output for later processing :

  executecommand = 'ffprobe -v quiet -print_format compact=print_section=0:nokey=1:escape=csv -show_entries stream=height "' + CurrentVideoToBeProcessed + '"'
  
  
  
  VideoHeight = subprocess.check_output(executecommand)

  This is the error that came about :

  subprocess.CalledProcessError : Command ’...’ returned non-zero exit
  status 1

  So when I modified the code to this :

  try:
  
      VideoHeight = subprocess.check_output(executecommand,shell=True,stderr=subprocess.STDOUT)
  
  except subprocess.CalledProcessError as e:
  
      raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))

  This is the error I get :

  RuntimeError : command ’...’ return with error (code 1) : b’’

  I assumed at first the issue was with the file names, but certain videos work and certain don’t, irregardless of the file name.
  This is the output I get in python for videos that work :

  b’360\r\n\r\n’

  Any idea what’s going on ? Thanks !

  Edit
  It turns out the problem is in the file names after all. From what I gather so far at least, numbers in file-names seem to be causing the error.
  Edit2
  I re-ran the code after I closed several cmd instances and I am not getting the error anymore. I don’t know why. I am sure, however that if I were to convert hundreds of videos again I’ll get the error eventually as it has always happened eventually.

• In which situation we need to used ffmpeg as Native (JNI) code in android ?

  16 octobre 2019, par axita.savani

  I am used FFmpeg as Library now. But when i have a search in google that some developers said that we can use FFmpeg with JNI as a native library but I’ll really don’t know why the developer said that, I think it’s related to the speed of exporting or code not display at App-decompile time.

  But I don’t know in which situations and which requirements then we used FFmpeg native code in android ?