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• FFMPEG How to join the audio of one song into the instrumental of another song

  28 mai 2020, par Patrice Andala

  The Problem :

  



  So I am creating an android app where people can upload music and I want people to be able to take the vocals of one song and the instrumental from another song and merge them to create a different song, and I think the android FFMPEG library is the best way to accomplish this.

  



  What I've been able to do :

  



  1.) I have been able to get the instrumental from a song using this command : -i audio1.mp3 -af pan='stereo|c0=c0|c1=-1*c1' -ac 1 output.mp3But the job isn't so good, since I can still hear some audio in the background and not all the audio is removed.

  



  2)I've been able to join two audio files using the command -y -i audio1.mp3 -i audio2.mp3 -filter_complex '[0:0][1:0] amix=inputs=2:duration=longest' -c:a libmp3lame output.mp3

  



  What I need

  



  1) I need to be able to strip just the vocals of a song. Is there an FFMPEG command to do this ?

  



  2)I need a better command to get me the instrumental of the song, since the one I'm using is not goood enough.

  



  3) I need a command that will help me determine the starting point of a song in an instrumental, so that I know where to place the new vocals when I finally merge them.

  



  4) How to get the bpm of an audio file with ffmpeg, since I know songs mix well when their bmp is almost similar

  



  Any help in any of these areas is greatly appreciated.

  


• Convert factory-class and factory-method to factory in Services.xml

  19 janvier 2016, par K Ф

  I’m using Symfony3 and I noticed that factory-class and factory-method don’t exist anymore, but factory does exist.

  This is rather frustrating because I would like to use pulse00/ffmpeg-bundle, but the services.xml seems to be pre-3.0.

  

  As you can see the 4 red marked attributes are the problem :

  factory-class="%dubture_ffmpeg.ffmpeg.class%" factory-method="create"
  
  factory-class="%dubture_ffmpeg.ffprobe.class%" factory-method="create"

  Example(Symfony3 version) :

  services:
  
      newsletter_manager:
  
          class:   NewsletterManager
  
          factory: [NewsletterManagerFactory, createNewsletterManager]

  Question :

  How do I update the services.xml for it to work correctly with Symfony3 ?

  What I have tried :

  I have tried combining the two without much success and using factory instead. But apparantly "factory" is not allowed either.

  Errors :

  $ php bin/console server:run 

  The error I am getting :

  The attribute ’factory-class’ is not allowed.

  

• Make a video file with the song cover for each song in a folder [closed]

  19 novembre 2024, par Nathan Kaufmann

  I have a folder full of wav audio files, and I would want, using ffmpeg in a batch file, to output as many video files as there is songs, with a still image of the cover, with the highest possible audio quality as permitted by ffmpeg. Additionally I would want the metadata (title, artist, album and year) to be copied to the corresponding video file.

  


  For now I have the command :
ffmpeg -f lavfi -i color=c=black:s=640x480 -i song.wav -c:v libx264 -tune stillimage -pix_fmt yuv420p -shortest -c:a aac -ar 96000 -b:a -metadata title="My title" 1000000000k output.mp4

  


  But it only makes a black video with the song, with the highest quality sound I could set, and it changes the title but I couldn't find how to change it to the song's title. Also for now I don't know how to automate it for a whole folder.