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• FFMPEG set volume in amix

  23 juin 2017, par user5839

  I’ve been trying to mix an audio mp3 with a video mp4 while retaining the mp4 audio. This is working with .

  ffmpeg -y  -i video.mp4 -i audio.mp3
  
   -filter_complex "[0:a][1:a]amix=inputs=2:duration=longest[out]" 
  
   -map 0:v -map [out] output.mp4

  I’m now trying to adjust the volumes of the sound files (video 0.5, audio 1) as part of the mix.

  I’ve been trying things like

  ffmpeg  -i 020c276b-face-4bb3-9169-e8969c1232ba.mp4 -i test.mp3 -filter_complex 
  
   "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1]; 
  
    [1:a]aformat=sample_fmts fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a2]; 
  
    [a1][a2]amerge,pan=stereo:c0code>

  And I get errors such as

  [Parsed_aformat_2 @ 037f8620] Error parsing sample format : sample_fmts
  fltp. [AVFilterGraph @ 038be620] Error initializing filter ’aformat’
  with args ’sample
  _fmts fltp:sample_rates=44100:channel_layouts=stereo’ Error initializing complex filters. Invalid argument

  Does anyone know how to make the code I’ve code above that is working, also change the volume of the inputs ?

  Thanks

• Simple ffmpeg merge and volume customization

  16 juin 2017, par 1234567

  I have following commands to change volume of audio, video and then merge it.

  First, change volume level of a MP3 File.

  ffmpeg -i audio.mp3 -vol 100 audio1.mp3

  then change volume level of a MP4 File.

  ffmpeg -i video.mp4 -vol 300 video1.mp4

  and then to merge both audio and video at specific time of video.

  String[] complexCommand = 
  
                 {"-ss", "" + startMs / 1000, "-y", "-i", video1.mp4`,"-i",
  
                 audio1.mp3, "-t", "" + (endMs - startMs) / 1000, "-s",
  
                 "320x240", "-vcodec", "mpeg4", "-b:v",
  
                 "2097152", "-b:a", "48000", "-ac", "2", "-ar", "22050", output.mp4};

  I want to simplify this into just one process.

  How can this be done ?

  I tried this command :

  String[] complexCommand = {"-i",STORE_DIRECTORY,"-i",yourRealPath,"-filter_complex","[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1];[1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a2];[a1][a2]amerge,pan=stereo:c0code>

  I am using https://github.com/WritingMinds/ffmpeg-android-java

  It gave me the error Unknown encoder '-vcodec' but when I tried to simply merge audio with video without volume customization, it worked fine.

• Add Audio to video with existing audio using FFmpeg and change volume of of both audios

  14 juin 2017, par 1234567

  Add Audio to video with existing audio using FFmpeg and change volume of both audios

  I am using this command from ffmpeg to merge audio to video

  video.mp4 has video and audio, and audio.m4a only has audio

  ffmpeg -i video.mp4 -i audio.m4a -map 0:v -map 1:a -c copy -shortest output.mp4

  I want to merge audio to video but maintain audio from both video and the new audio file

  I also want to change the volume of audio file that I want to add from current file to 1.5 times

  and change the audio from the video file to 0.5 times

  how can we change the volume and still maintain new and old audio in the merged file