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• ffmpeg command and args execute successfully with child_process.exec() but not child_process.spawn()

  15 octobre 2013, par Zugwalt

  I am trying to use ffmpeg to add text to a video via the drawtext filter from within node.js in a windows environment.

  I have a command and arguments that work in the command line and when executed using the child_process module's exec function, but it encounters an error when the same arguments are used with the spawn function.

  The below code illustrates the problem :

  var child_process = require('child_process');
  
  
  
  var cmd = 'ffmpeg';
  
  
  
  var args = [ '-i',
  
               'c:\\path\\to\\my\\inputfile.mp4',
  
               '-vf',
  
               'drawtext="fontfile=/Windows/Fonts/arial.ttf:text=\'Hello World\':fontcolor=white@0.6:fontsize=70:x=0:y=40"',
  
               '-y',
  
               'c:\\path\\to\\my\\outputfile.mp4' ];
  
  
  
  // Above creates the command line equivalent of:
  
  // ffmpeg -i c:\path\to\my\inputfile.mp4 -vf drawtext="fontfile=/Windows/Fonts/arial.ttf:text='Hello fluent text':fontcolor=white@0.7:fontsize=70:x=0:y=40" -y c:\path\to\my\outputfile.mp4
  
  // this works when run from the command line
  
  
  
  var execCmd = cmd+' '+args.join(' ');
  
  
  
  child_process.exec(execCmd, function (error, stdout, stderr) {
  
          /* ffmpeg runs fine, adding the text to the video */
  
  
  
          var spawn = child_process.spawn(cmd,args);
  
  
  
          spawn.on('close', function (code) {
  
              /* ffmpeg fails, with standard error (obtained via spawn.stderr) reading:
  
                 Could not load font ""fontfile=/Windows/Fonts/arial.ttf": impossible to find a matching font
  
                 Error initializing filter 'drawtext' with args '"fontfile=/Windows/Fonts/arial.ttf:text=Hello fluent text:fontcolor=white@0.6:fontsize=70:x=0:y=40"'
  
              */
  
          });
  
      });

  Based on the error message :

  Could not load font ""fontfile=/Windows/Fonts/arial.ttf" : impossible
  to find a matching font

  And comparing it to giving ffmpeg a bogus font on the command line :

  Could not load font "/Windows/Fonts/bogus.ttf" : impossible to find a
  matching font

  It seems the problem is that when executed from spawn the drawtext argument is incorrectly parsed and "fontfile= is incorrectly making its way into the font's path. This does not happen when the same argument is executed with exec or from the command line. Is there any additional escaping that needs to be done when executing using spawn ?

• Which Dedicated Server for FFMPEG ?

  11 février 2017, par OarSmaN

  My website converts video to audio and video to video using FFMPEG (full Centos 64bit install). Mostly i got multiple conversions (10-20) real time. I use cache for already converted audios/videos. I am currently moving to a dedicated server and i need to know which configuration would be best for my situation.

  Which of the below servers is better for FFMPEG ;

  SINGLE Intel® Xeon® Processor E3-1270 v5, 8M Smart Cache, 3.60 GHz, 8 GT/s DMI3 (4 Cores-8 Threads) / 32GB DDR4 2133 / 240GB S3500 Intel Wolfsville SSD + 1TB Enterprise Grade HDD (for caching)

  DUAL Intel® Xeon® Processor E5-2620, 15M Smart Cache, 2.00 GHz, 7.20 GT/s Intel® QPI (12 Cores-24 Threads) / 32GB DDR3 1333 / 120GB S3500 Intel Wolfsville SSD + 1TB Enterprise Grade HDD (for caching)

  thanks for your ideas.

• Add date of creation to the metadata title in ffmpeg

  13 mai 2023, par Louis Did

  I record a live radio stream 3 times a week and would like to be able to add the date of the recording/creation time to the metadata title using ffmpeg. I want to see the title of the show with date of the recording on it when I play the mp3 file. For example : the title displayed on the player will be like this : Nocturnes 5-13-2023.

  


  I have tried the following :

  


  ffmpeg -i https://medfm.net/live/medfm.mp3 -t 00:05:00.00 -metadata title="Nocturnes $(date +%m-%d-%Y)" -c copy -f segment -strftime 1 -segment_time 3200 Nocturnes_%Y_%m_%d.mp3