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• Systemd service (python loop -> ffmpeg stream)

  7 janvier 2019, par Kevitto

  I am currently running a stream with ffmpeg, through icecast2 through a python snippet (Fig1). I have created a systemd service to run said python script on boot (Fig2) and use a custom target (Fig3) to make sure it loads once every other service is loaded, mostly for icecast2.

  I’ve conducted multiple tests, and the stream works fine if launched either from the python code or if I restart the service attached to it.

  My problem is, on a (re)boot of the system, the service runs for approximately 15 seconds, then the stream dies. I’ve read so much on python and systemd, but I can’t for the life of me figure out where the problem lies. I’ve tried changing my python code, the unit load order and anything else I found online that could help, but found nothing.

  Fig1 (dxstream.py)

  import sys
  
  import time
  
  import subprocess
  
  
  
  def start():
  
      return subprocess.Popen(r’ffpmeg -re -f alsa -ac2 -i hw:1,0 -acodec mp3 -ab 320k -f mp3 icecast://sourcehackme@localhost:8000/stream', shell=True)
  
  
  
  testProcess = start()
  
  
  
  while True:
  
  
  
      res = testProcess.poll()
  
      if res is not None:
  
          testProcess = start()
  
      time.sleep(1)

  Fig2 (dxstream.service)

  [Unit]
  
  Description=ffmpeg stream starter
  
  After=multi-user.target
  
  [Service]
  
  Type=idle
  
  Execstart=/usr/bin/python /usr/local/bin/dxstream.py
  
  Restart=on-failure
  
  
  
  [Install]
  
  WantedBy=custom.target

  Fig3 (custom.target)

  [Unit]
  
  Description=Custom Target
  
  Requires=multi-user.target
  
  After=multi-user.target
  
  AllowIsolate=yes

• Pulseaudio record multiple xfbv screens with python

  10 octobre 2020, par Eric Lagarda

  I’m trying to do something complicated and I need some help.

  


  I’m able to record a session (video and audio) with python using xvfb and ffmpeg.

  


  I just want to visit a page using selenium and record the video and audio. It’s working but when I try to run multiple instances, the audio is mixing between records.

  


  How can achieve that ? I’m using pulseaudio. I know that with alsa you can set like a interface per instance, but I don’t know how to do it.

  


  Thanks for you support and comments.

  


• ffmpeg command to python

  24 mars 2020, par user7356972

  I have following below command that to overlay two videos.
  I want to convert it into python code using ffmpeg-python.
  Please help me with it.

  ffmpeg -y\
  
      -i {0} -i {1} \
  
      -filter_complex \
  
          "[0:v]setpts=PTS-STARTPTS, scale=480x360[top]; \
  
                         [1:v]setpts=PTS-STARTPTS, scale=480x360,\
  
                         format=yuva420p ,colorchannelmixer=aa=0.5[bottom]; \
  
                         [top][bottom]overlay=shortest=1 "\
  
                         -vcodec libx264 out.mp4'.format(f1,f2))

  My code right till now.

  import ffmpeg
  
  
  
  in_file = ffmpeg.input('New.mp4')
  
  overlay_file = ffmpeg.input('psa2.mp4')
  
  (
  
      ffmpeg
  
      .concat(
  
          in_file.setpts(expr=PTS-STARTPTS),
  
          overlay_file.setpts(expr=PTS-STARTPTS)    
  
         )
  
      .overlay(shortest=1)
  
      .output('out.mp4')
  
      .run()
  
  )