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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.

• cbs_mpeg2 : Rearrange start code search

  29 juillet 2019, par Andreas Rheinhardt

  cbs_mpeg2 : Rearrange start code search
  1. Currently, cbs_mpeg2_split_fragment uses essentially three variables
  
  to hold the start code values found by avpriv_find_start_code. By
  
  rearranging the code, one of them can be omitted.
  
  2. The return value of avpriv_find_start_code points to the byte after
  
  the byte containing the start code identifier (or to the byte after the
  
  last byte of the fragment's data if no start code was found), but
  
  cbs_mpeg2_split_fragment needs to work with the pointer to the byte
  
  containing the start code identifier ; it already did this, but in a
  
  clumsy way. This has been changed.
  
  3. Also use the correct type for the variable holding the
  
  CodedBitstreamUnitType.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/cbs_mpeg2.c