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• subprocess.check_output fails with CalledProcessError but error is empty string. Command works in terminal

  11 août 2022, par Leonardo the Vinchi

  I want to run the command ffprobe -i test.m4a -show_entries format=duration -v quiet -of csv="p=0". It works in the terminal and returns output code 0, but running it with subprocess, i.e.

  


  subprocess.check_output(['ffprobe', '-i', 'test.m4a', '-show_entries', 'format=duration', '-v', 'quiet', '-of', 'csv="p=0"'])


  


  raises a CalledProcessError - {Command} returned non-zero exit status 1.. I tried running this command in a try-except loop and printing the error details, but it just outputs as an empty byte string b''.

  


• ffmpeg : don’t reconfigure terminal if we’re not taking input from stdin

  8 septembre 2016, par Rodger Combs

  ffmpeg : don’t reconfigure terminal if we’re not taking input from stdin
  

  • [DH] ffmpeg.c
  • [DH] ffmpeg_opt.c

• Real time ffmpeg output from terminal in php

  8 novembre 2014, par user2978381

  I am using this code to get real time update from windows terminal. It doesn’t output anything in the browser but process the command and in the background and completes the conversion.

      set_time_limit(0);
  
      $ffmpegCommand  = 'C:\\ffmpeg\\bin\\ffmpeg';
  
  
  
      $handle = popen($ffmpegCommand." -i upload/1415292048.mp4 -ar 22050 -ab 32 -f flv -s 640x320 -vcodec libx264  -vsync 1  -bt 50k converted/video001.flv", "r");
  
  
  
      if (ob_get_level() == 0) 
  
          ob_start();
  
  
  
      while(!feof($handle)) {
  
  
  
          $buffer = fread($handle, 4096);
  
          $buffer = trim(htmlspecialchars($buffer));
  
          echo "<pre>";
  
  
  
          echo $buffer ;
  
          echo str_pad('', 4096);
  
          echo "</pre>";
  
  
  
          ob_flush();
  
          flush();
  
          sleep(1);
  
      }
  
  
  
      pclose($handle);
  
      ob_end_flush();

  But when the same code I am using for youtube_dl it updates in the real time.

      header('Content-Encoding: none;');
  
  
  
      set_time_limit(0);
  
  
  
      $handle = popen("python -m youtube_dl -F http://vimeo.com/30261818", "r");
  
  
  
      if (ob_get_level() == 0) 
  
          ob_start();
  
  
  
      while(!feof($handle)) {
  
  
  
          $buffer = fread($handle, 4096);
  
          $buffer = trim(htmlspecialchars($buffer));
  
          echo "<pre>";
  
  
  
          echo $buffer ;
  
          echo str_pad('', 4096);
  
          echo "</pre>";
  
  
  
          ob_flush();
  
          flush();
  
          sleep(1);
  
      }
  
  
  
      pclose($handle);
  
      ob_end_flush();

  So if I want to show output of ffmpeg in the browser what should I do ?