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• How do I use ffmpeg's `filter_complex` `volume` filter on videos that might not have an audio track ?

  9 mars 2023, par jaygooby

  I'm mixing new audio tracks into videos, and I want the original video audio to be at a lower volume in the mix :

  


  ffmpeg -i audio.wav -i video.mp4 -c:v copy -filter_complex "[1:a:0]volume=0.5[originalAudio]; [0:a:0][originalAudio]amix=inputs=2[m]" -map [m] -map 1:v:0 tmp.mp4


  


  that sets the original video audio to be 50% less than it was, when audio.wav is mixed with it. This works fine until there's a video with no audio track. Then I get the error :

  


  Stream specifier ':a:0' in filtergraph description [1:a:0]volume=0.05[originalAudio]; [0:a:0][originalAudio]amix=inputs=2[m] matches no streams.


  


  because the video has no audio track.

  


  Is there a way for me to use ffmpeg filters in the same call, to ensure there's an audio track if one is originally missing, so I don't need to check for the presence of an audio track using an additional step with ffprobe, mediainfo etc ?

  


  [Edit 1] Looks like I need to add a anullsrc track to the video inside the filter_complex, and then not specifically choose which audio track from the video I want, so either the original or the new silent one (if it's the only one present) is selected via ffmpeg's automatic stream selection...

  


  [Edit 2] Something like this, where I have 2 audio inputs, the first is silence and the second is the input wav. Use concat to pick either the silence or the video audio, use the result of that to reduce the volume, then mix in the new audio to the result of that, but I'm not there yet :

  


  ffmpeg -f lavfi -i anullsrc \
       -i audio.wav \
       -i video.mp4 \
       -c:v copy \
       -filter_complex \
       "[0:a] [2:a] concat=n=2:v=0:a=1 [silence-or-video-audio];
        [silence-or-video-audio]volume=0.5[reduced-audio]; [1:a:0][reduced-audio]amix=inputs=2[mixed-audio]" \
       -map "[mixed-audio]" \
       -map "[2:v:0]" \
       tmp.mp4


  


  The error is : Stream specifier ':a' in filtergraph description [0:a] [2:a] concat=n=2:v=0:a=1 [silence-or-video-audio]; [silence-or-video-audio]volume=0.5[reduced-audio]; [1:a:0][reduced-audio]amix=inputs=2[mixed-audio] matches no streams.

  


• How to increase or decrease volume for multi input in ffmpeg ?

  15 mars 2023, par Ali Azmoodeh

  I have an input file, I want the volume of the input file to increase when the loop reaches index 7, otherwise the volume is small, I need to merge it in these, Is it possible to set a filter for each input ?

  


  createPhoneNumberAudioWithEncrypt('09030207892');

function createPhoneNumberAudioWithEncrypt(mobilNumber) {

   mobilNumber = mobilNumber.split('').reverse();

   let mergedVideo = ffmpeg();

   for (let i = 0; i < mobilNumber.length; i++)
      if (i >= 7)
         mergedVideo = mergedVideo.input(`./sound/${mobilNumber[i]}.mp3`);
      else
         mergedVideo = mergedVideo.input(`./sound/${mobilNumber[i]}.mp3`);

   mergedVideo.mergeToFile('./mergedAudio.mp3');

}


  


• discordjs/voice : Changing volume does not have any effect

  27 avril 2023, par Coxcopi

  I'm using @discordjs/voice for a bot. When I try to change the audio volume of a resource, no matter if it's while the resource is being played currently or if I do it before playing it, it doesn't seem to have any effect.

  


  My code for creating the resource looks like this :

  


  const stream = ytdl(url, {
    filter: "audioonly",
    format: "mp3",
    highWaterMark: 1 << 62,
    liveBuffer: 1 << 62,
    dlChunkSize: 0,
    bitrate: 128,
    quality: "lowestaudio"
})
const resource = createAudioResource(stream, {inlineVolume: true});


  


  And for changing the volume before playing :

  


  resource.volume.setVolume(audioVolume);
audioPlayer.play(resource);


  


  I've tried audioVolume values between 0.0-1.0 as well as between 0-100 but no matter the value, the audio volume stayed exactly the same. Any Ideas what could be the issue here ?