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• Using ffplay to open a video at a specific window location [on hold]

  18 août 2014, par Willette Lynch

  I need to use ffplay to open a video file, but i need to pass it x,y coordinates so i can have it play the video where I want it to.

  As default ffplay simply opens the video at the top left corner.

  I’ve tried searching for options in ffplay but i couldnt find it.
  Also tried using window managers like fluxbox, again couldnt find the command)

  Please note that I need to run it as a shell command.

  Any Help would be appreciated.

  Thanks in Advance

• Add silence at the end of a .wav file created from a .mp4 using ffmpeg

  27 mars 2019, par Georgiana_M

  I want to generate .wav files from .mp4 ones using ffmpeg. In this command I want to include an option so that all the wav files have the same duration (add some seconds of silence at the end of each generated file).

  I saw here that you can add some options but they don’t seem to work in my case.

  This is what I have so far :

  command = "ffmpeg -i " + mp4_file_path + " -filter_complex [1:a][0:a]concat=n=2:v=0:a=1 -ab 160k -ac 1 -ar 44100 -vn " + wav_file_path
  
  
  
  subprocess.call(command, shell=True)

• subprocess Task fail after 8min when run inside Flask or BaseHTTPServer

  6 août 2015, par jthemovie

  I’m doing live HLS encoding with ffmpeg, and i usually run it via a python program as follow (i made some shortcuts...) :

  import subprocess
  
  
  
  def main():
  
      subprocess.Popen("ffmpeg -i .... (live hls encoding)", shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
  if __name__ == '__main__':
  
     main()

  And everything works like a charm, but when i use Flask or BaseHTTPServer, the very same weird behaviour occurs.

  After around 8min (more or less few seconds), the program stop responding and the encoding stop.

  import subprocess
  
  from flask import Flask, url_for, request, json, Response
  
  
  
  @app.route('/api/v2/livetv', methods = ['POST'])
  
  def api_live():
  
      subprocess.Popen("ffmpeg -i .... (live hls encoding)", shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
      return "-"
  
  
  
  if __name__ == '__main__':
  
     app.run(host='127.0.0.1', port=5001,debug=True)

  I tried using BaseHTTPServer, the very same behaviour occurs, it usually stop encoding after the segment number 46, or 47, which correspond at those 8 min.

  I have no idea why this behavior occurs. For example, the first script, once terminated, the ffmpeg will continue in background, while if i terminate the script with the web server, the ffmpeg program will exit as well.

  So if anyone could help me out with that, i would be more than glad.

  Thanks a lot for your help.

  Regards

  ps : if interested , my ffmpeg line look like this :

  /usr/bin/ffmpeg -user-agent "A User Agent" -headers "X-Forwarded-For:x.x.x.x"$’\r\n’ -re -i "http://..../index_2000_av-p.m3u8" -c:v libx264 -profile:v baseline -preset medium -x264opts level=41 -b:v 500k -s 600x340 -g 90 -bf 2 -c:a copy -f hls -hls_list_size 20 -hls_time 10 -hls_flags delete_segments -hls_segment_filename /var/www/livestream/"segment%03d.ts" /var/www/livestream/playlist.m3u8