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• Add line to FFmpeg waveform without a background

  26 février 2024, par kaif15

  I am trying to write an ffmpeg command to generate a waveform from audio. I've managed to generate the waveform but I fail when trying to add a line such that the silent areas are not blank.

  


  Currently the command is :

  


   -filter_complex "[0:a]aformat=channel_layouts=mono,compand=attacks=0:points=-80/-900|-45/-15|-27/-9|0/-7|20/-7:gain=15,showwavespic=s=180x26:colors=#7c84cc[fg];color=s=180x26:color=#303030[bg];[bg][fg]overlay=format=auto,drawbox=x=(iw-w)/2:y=(ih-h)/2:w=iw:h=1:color=#7c84cc" -frames:v 1


  


  I have added some tweaks of my own to boost the visual appeal but what I would like is to use the drawbox without the color filter. If I try to do that the line disappears during the silent part.

  


  I have also attempted to use a transparent image as the background but that failed as well.

  


  I have relied heavily on this question when approaching this problem :
  
Generating a waveform using ffmpeg

  


• Fade in and out audio repeatedly of an audio source using ffmpeg

  1er avril 2022, par corgrath

  I am wondering if this is possible with FFMPEG. If not, I am interested what the closest solution could be.

  


  I have an audio file ; input.mp3

  


  I would like to do this repeatedly over the whole track ;

  


  

  • Play the audio for 10 seconds

  


  • Fade out to silence

  


  • The track is silent for 10 seconds

  


  • Fade in the audio again

  


  • The track is playing for 10 seconds

  


  


  Then output the audio.

  


  With other words, I would like to continuously play the audio of an input every other 10 seconds with fade in and out effects.

  


  I am not sure if this is possible with FFMPEG to continuously do that.

  


  If it is not possible to continuously do that until the end of the track, I can create a script that does that if timestamps are needed. If so, I need to learn how to fade in at X, play for Y seconds, fade out (alternatively, fade out at X, it remains silent for 10 seconds, then fade in at Y).

  


  Any advice is appreciated !

  


  Update !

  


  Now that I think about it, the question is more about adjusting input sound volumes across time !

  


• trying to merge audio with video

  9 juillet 2019, par vikram

  i am using ffmpeg for merging audio and video. i have download 4 sec mp3 file trying to merge but not successful. i am also trying to merge silent audio it works but the video become half of its original length.

    this command for silent audio works but cut video
  
  
  
  
  
  
  
    String mergecmd1[]={"-i",output,"-f", "lavfi" ,"-i", "aevalsrc=0", " - 
  
    shortest", "-y", output};     
  
  
  
     this command for mp3 audio but not working 
  
  
  
     String cmd1[]={"-i", output ,"- 
  
     i","/storage/emulated/0/FestiveApp/Assets/audio.mp3" ,"-codec", "copy", 
  
     "-shortest", output};
  
  
  
  
  
  
  
  
  
  
  
  
  
           ffmpeg = FFmpeg.getInstance(Donts_Activity.this);
  
      try {
  
  
  
          ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {

  // Log.e("ffmpeg","Exaction Start") ;
  }

              @Override
  
              public void onProgress(String message) {}
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  progressDialog.dismiss();
  
                  Log.e("ok",message);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  new Sessionmanager(Donts_Activity.this).SetImageToVideoPath(output);
  
  
  
                  Log.e("ok","success");
  
  
  
  
  
                  progressDialog.dismiss();
  
  
  
                  Intent intent=new Intent(Donts_Activity.this,MediaRecorderRecipe.class);
  
                  startActivity(intent);
  
                  finish();
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
  
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          Log.e("ffmpeg",e.toString());
  
          progressDialog.dismiss();
  
      }

  my first goal generate video with audio but video length does not be reduce or cut if i am using mp3 or silent ffmpeg audio command