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• Meteor edit audio files on the server

  28 décembre 2015, par Mohammed Hussein

  I am building a Meteor application to split uploaded audio files
  I upload the audio files and store them using GridFS

  child = Npm.require(’child_process’) ;

  var fs = Npm.require('fs');
  
  
  
  
  
  storagePath= fs.realpathSync(process.env.PWD+'/audio');
  
  StaticServer.add('/audio', clipsPath);

  and then using a method i split the audio file using
  child.exec(command) ;

  the command is the ffmpeg command used to cut the source audio file and store it on the storagePath

  the application worked fine locally but when I tried to deploy it to digital ocian i got errors , stating that the file /audio doesnot exist
  I use mupx to deploy and the error appears after "verifying deployment"

  here is the error

      -----------------------------------STDERR-----------------------------------
  
      eteor-dev-bundle@0.0.0 No README data
  
      => Starting meteor app on port:80
  
  
  
      /bundle/bundle/programs/server/node_modules/fibers/future.js:245
  
                                                      throw(ex);
  
                                                            ^
  
      Error: ENOENT, no such file or directory '/bundle/bundle/audio'
  
          at Object.fs.lstatSync (fs.js:691:18)
  
          at Object.realpathSync (fs.js:1279:21)
  
          at server/startup.js:10:20
  
          at /bundle/bundle/programs/server/boot.js:249:5
  
      npm WARN package.json meteor-dev-bundle@0.0.0 No description
  
      npm WARN package.json meteor-dev-bundle@0.0.0 No repository field.
  
      npm WARN package.json meteor-dev-bundle@0.0.0 No README data
  
      => Starting meteor app on port:80
  
  
  
      /bundle/bundle/programs/server/node_modules/fibers/future.js:245
  
                                                      throw(ex);
  
                                                            ^
  
      Error: ENOENT, no such file or directory '/bundle/bundle/audio'
  
          at Object.fs.lstatSync (fs.js:691:18)
  
          at Object.realpathSync (fs.js:1279:21)
  
          at server/startup.js:10:20
  
          at /bundle/bundle/programs/server/boot.js:249:5
  
  
  
      => Redeploying previous version of the app
  
  
  
      -----------------------------------STDOUT-----------------------------------
  
  
  
      To see more logs type 'mup logs --tail=50'
  
  
  
      ----------------------------------------------------------------------------

  the main quistion is , how to i generate an output file using ffmpeg command and store it in a place where I can access it and display it on the browser

• Removing Silence from m4a files using ffmpeg

  27 juin 2015, par Tejas Shah

  I have an audio file which has both leading and trailing silence and with the following specifics :

  Codec : MPEG AAC Audio (mp4a) Channels : Stereo Sample rate : 44100 Hz Bitrate : 253 kbps

  I want to remove the silences AND keep the quality intact.

  So far I’ve tried

  ffmpeg -i 1.m4a -af silenceremove=1:0.5:0:1:0.5:0 2.m4a 

  This is supposed to remove both the leading and trailing silences.
  But for some reason it doesn’t remove the trailing silence. This seems to be a recurring problem. Found the following on another forum.

  http://ffmpeg-users.933282.n4.nabble.com/How-to-delete-digital-silence-tp4667256p4667356.html

  Also, ffmpeg reduces the bitrate to 128kbps. This I could fix by adding -ab 253k and making the command :

  ffmpeg -i 1.m4a -af silenceremove=1:0.5:0:1:0.5:0 -ab 253k 3.m4a 

  Now the problem is that the trailing silence isn’t removed and when I want to process a batch of files I can’t use the same bitrate (like 253kbps ) for every file. I’d like to know how VBR could be used for this case.

  I know I can use sox and use the silence and reverse features to trim the silences.

  http://digitalcardboard.com/blog/2009/08/25/the-sox-of-silence "Example 3 in this post"

  But sox has the following problems :

  1. It can’t handle m4a files, I had to convert all files to mp3.

  2. When using the silence filter in sox it caps the bitrate at 128kbps.

     sox 1.mp3 2.mp3 silence 1 0.5 1% reverse silence 1 0.5 1% reverse

• Join us for the Piwik Community Meetup 2015 !

  25 juin 2015, par Piwik Core Team — Community, Meta

  

  We’re excited to announce that our third Piwik Community Meetup will be held in Berlin on Tuesday, the 4th of August, 2015. Don’t miss this great opportunity to connect with other users and meet the core team behind Piwik. It’s free, so REGISTER TODAY ! And maybe you would like to share your Piwik use case ? We’re also waiting for your presentation ideas.

  We will cover some of the upcoming features, discuss the future of Piwik, share tricks and hacks to help you get the most out of your Piwik platform, and socialise. If you use Piwik to improve your websites and apps, or are just generally curious about digital analytics and marketing – this event is not to be missed. As our core team is scattered all over the world, this will be a rare opportunity for you to meet and talk to us all at once – especially for those of you interested in the platform, integrating your app with Piwik, and building plugins.

  After the official part, we would like to enjoy drinks with all the participants in the nearby bars. We hope you will be able to join us !

  All Piwik community members are warmly invited to take part in the meetup !

  Piwik Community Meetup 2015

  When ?

  Tuesday, the 4th of August, from 5-9pm

  Where ?

  Kulturbrauerei
  Schönhauser Allee
  Prenzlauer Berg area
  Berlin, Germany
  exact directions tbc.

  Languages :

  English and German

  Book tickets :

  BOOK YOUR FREE INVITATION HERE

  Open call for YOUR presentation ideas

  We would also like to hear how you use Piwik – we’ll be delighted if you’d share your interesting use case during the Meetup. Please send your presentation ideas (speaking time : 5 to 7 minutes) to : meetup@piwik.pro ! Deadline : 20th of July 2015.

  Contact the organisers :

  meetup@piwik.pro