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• Record local audio in a docker container

  17 juillet 2015, par pablo

  How can I record the audio of an application like Firefox inside a docker container with ffmpeg ?
  I’ve found examples how to forward pulseaudio to the host - netflix, skype.

  When I’m trying to use pactl :

  pactl list sources

  Or

  docker exec -it  bash
  
  apt-get install pulseaudio
  
  pactl load-module module-native-protocol-unix auth-anonymous=1 socket=/tmp/.pulse-socket

  I’m getting an error :

  Connection failure: Connection refused
  
  pa_context_connect() failed: Connection refused

  This also fail

  ffmpeg -f pulse -i default /tmp/pulse.wav

• FFMPEG PHP - Converting gif to mpeg

  15 août 2014, par Kyle Goodrich

  I’d like to create a simple script that converts gifs to mpegs using FFMPEG PHP. The script works when using FFMPEG in terminal. When I use a similar script using FFMEG PHP and host it on my domain, the script converts the gif to an mpeg, but only converts one frame of it. This is strange because the FFMPEG line of code that is responsible for the conversion is essentially the same line used previously in terminal. I’ve made sure that my web host (cirtex) has FFMPEG installed in their server. Also, I made sure to edit my php.ini file for FFMPEG use.

  The script I created consists of two parts - uploader.php and uploader_02.php.

  uploader.php is a simple submit form, where the user uploads and submits a gif.

  uploader_02.php receives the gif and copies it over to another directory on the server. Then, the script applies the FFMPEG conversion to the saved gif.

  Here’s are the lines of php that are responsible for the conversion :

  <?php
  
  // ffmpeg
  
  $ffmpeg = "/usr/bin/ffmpeg";
  
  $videoFile = "test_videos/" . $name;
  
  $output = "test_videos/instagram.mpg";
  
  $cmd = "$ffmpeg -i $videoFile -vb 5M -y $output";
  
  exec($cmd);   
  
  ?>

  For some reason, only one frame of the gif is converted into mpeg format. Not sure what is causing this problem.

  Any information regarding this issue will help out a lot.

• What resolution would be best for processing videos in firebase functions ? [closed]

  11 janvier 2020, par Nathan

  I’m making an app that is mainly used for sharing videos of maximum 30 seconds long. One video example could be a screen recording of someone’s computer screen or a game. I have this code that checks whether the uploaded video that has just been uploaded to firebase storage has been processed or not and if it hasn’t then I use ffmpeg to process the video (change the resolution etc.) with this command :

  const promise = spawn('./ffmpeg', ['-i', tempFilePath, '-vf', 'scale=1280:720', targetTempFilePath]);

  Now with these commands, the firebase function is giving me a timeout error when I upload 30 second clips since I’m only converting the video to 720. I was just wondering what compression settings would be sufficient enough for the video to :

  1. Be still a high enough quality in my app
  2. Not take ages processing the video in the function (10-20 second clips works perfectly well).

  I know the better option would be to use Googles App engine or something similar to process videos but I’d prefer it to avoid that at the moment, if I can’t process videos to a good enough quality without sacrificing efficiency then I will go to something like Google’s App engine, just need some advice and some pointers for it otherwise.

  EDIT :

  I’ve seen instagram compresses their videos to a resolution of 640x640 ? Would that be reasonable or is it dependent on the original clip’s resolution ?

  Thanks