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• concat 2 mini audio files and make a loop and add a background music

  11 octobre 2020, par Johny Sharma

  I Need to concatenate 2 small audio files with loop and add background music in a single command.

  



  I am capable to concatenate two audio files with a background music. My above given code is working.

  



  ffmpeg -i 1.mp3 -i 2.mp3 -i background.mp3 
-filter_complex "[0:0][1:0]concat=n=2:v=0:a=1,volume=1dB,aformat=fltp, pan=stereo|c0=c0|c1=c0[a0]; 
[2]volume=0.5dB,aformat=fltp,pan=stereo|c0=c0|c1=c1[a1];[a0][a1]amix=inputs=2:duration=longest,aformat=fltp[a]"
-map "[a]" -strict -2 -y output.mp3


  



  but i want to a make a loop of the concatenated files till the end of the background music. background music is longer than approx 5 times from concatenated files.

  



  If someone can suggest a single command solution.

  



  I know about amovie tag but unfortunately its not possible to use in here because amovie requires file name which is not possible with concatenated files as per my knowledge.

  



  Can anyone help me how can i achieve my goal !

  



  Thanks

  


• How to add outro background music to another audio file with FFMpeg ?

  8 novembre 2019, par Sebastian

  I have two files : story.wav (180 seconds) and background-music.wav (90 seconds). I need a FFMpeg command that merges the two files and fades in background-music.wav (with esin) 30 seconds before the end of story.wav.

  I have this in separate commands :

  ffmpeg -i background-music.wav -filter_complex afade=t=in:curve=esin:ss=0:d=30 fadein.wav
  
  ffmpeg -i fadein.wav -af "adelay=150000|150000" delayed.wav
  
  ffmpeg -i delayed.wav -i story.wav -filter_complex amix=inputs=2:duration=longest final.wav

  This is ugly - and it has the problem, that the volume of the first part is only 50% (the volume should be kept).

  There must be an elegant way to achieve this in one command - but how ?

  Bonus question : how can I convert the result to mp3 (with parameters like bit rate set) in the same command ?

  Thanks for any help !
  Sebastian

• How to modify music pitch in audio of video file and still sound natural

  9 janvier 2020, par Keith Bennett

  I have some karaoke .mp4 video files (legally obtained) for Thai songs, and want to convert the pitch downward to fit my singing range. I’ve gotten most of the way there thanks to https://superuser.com/questions/292833/how-to-change-audio-frequency/1076762#1076762
  using a command line like this :

  ffmpeg -i in.mp4 -af 'asetrate=35280.0,atempo=1.25' out.mp4

  ...but the instruments and human singing voices don’t sound natural at the modified pitch.

  Is there a better way to change the pitch ? I know some commercial products can do this.

  By the way, I wrote a Ruby script to simplify this ffmpeg call ; it’s at https://gist.github.com/keithrbennett/9ba7043792bfb2fcc92d615076a8413f. It enables you to specify a single factor, and modifies both pitch and tempo accordingly.