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• How can I play audio file(.mp3, .flac, .wav) and then loop over it (mix every few seconds) another audio file(wav) using ffmpeg

  11 mars 2019, par lukistar

  I got two different commands.

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[0:a]atrim=end=10,asetpts=N/SR/TB[begin];[0:a]atrim=start=10,asetpts=N/SR/TB[end];[begin][1:a][end]concat=n=3:v=0:a=1[a]" -map "[a]" output

  This command inserts second.mp3 into input.mp3. It seems to always keep the parameters of input.mp3. It inserts it in exact 10 seconds of input.mp3.

  Here is the second command :

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[1:a]adelay=10000|10000[1a];[0:a][1a]amix=duration:first" output

  This command is closer to my final goal. It plays input.mp3 and in exact 10 seconds it plays along second.mp3 without stopping input.mp3’s sound.(I think that’s called mixing ?)

  My final goal is to create final.mp3.

  Its duration must always equal input.mp3 duration. It must keep the samplerate, the count of channels, etc of input.mp3

  When playing final.mp3, it must play the whole input.mp3.
  But each 10-15 seconds, it must play second.mp3 without stopping input.mp3.(mix)
  It could be said that I must use "Second command" but in a loop.
  It would be great if there is one-line command for that in ffmpeg.
  I am working with flac, mp3 and wav and both of the commands were suitable for that.

  For example :

  input.mp3 could be 40 seconds long.

  second.mp3 could be 2 seconds long.

  When I play final.mp3 it will be 40 seconds long, but each 10-15 seconds(on random) it will play second.mp3 at the same time as input.mp3.

  Sadly I have no experience with ffmpeg, both of the commands I got are answers to questions here in stackoverflow. Hope somebody can help me. Thank you !

• Adding audio into mp4 file with ffmpeg [on hold]

  18 avril 2015, par minto

  I want embed audio in .MP4 video file. Video does not contain any audio.

  MP3 audio track may be shorten or longer than actual MP4 video lenght, so I want loop audio when I will use shorter audio track, or truncate it when audio track is longer than video. Looping audio isn’t so important, though.

  How to make this correctly with ffmpeg ?

• converting from wav audio file to pcm audio file using ffmpeg javascript

  22 juillet 2014, par lama

  I’m using ffmpeg but as javascript not php.I want to convert from wav file to pcm.the conversion to mp3 or wma is working fine but not to pcm it’s telling me that at least one input must be selected what is the error ?here is my code(command lines only) :

  var arguments = [];
  
      arguments.push("-y");
  
      arguments.push("-vn");
  
      arguments.push("-i");
  
      arguments.push(fileName);
  
  
  
      arguments.push("-b:a");
  
      arguments.push(getBitrate());
  
  
  
      switch (getOutFormat()) {
  
      case "mp3":
  
          arguments.push("-acodec");
  
          arguments.push("libmp3lame");
  
          arguments.push("out.mp3");
  
          break;
  
      case "wma":
  
          arguments.push("-acodec");
  
          arguments.push("wmav1");
  
          arguments.push("out.asf");
  
          break;
  
      case "pcm":
  
          //arguments.push("s16le");
  
          arguments.push("-ac");
  
          arguments.push("1");
  
          arguments.push("-f");
  
  
  
          //arguments.push("pcm_s16le");
  
          arguments.push("out.pcm");
  
      }