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• FFMPEG : Add multiple audio files to the video

  21 juillet 2023, par Yuriy N.

  I added three audio files (one per time) to the silent video using this command :

  


  ffmpeg \
    -i video1.mp4 -i audio1.mp3 \
    -filter_complex " \
        [1:a] adelay=10000|10000 [voice]; \
        [0:a][voice] amix=inputs=2:duration=longest [audio_out] \
        " \
    -map 0:v -map "[audio_out]" \
    -y output.mp4 


  


  Taken from here

  


  The problem is that every time the audio file is added the previously added audio is muffled a bit. So, finally, the full audio track looks like this :


  


  Any ideas why and how to fix it ?

  


  I would also consider any other working approach.

  


• ffmpeg add music to video playing after video

  11 janvier 2018, par Anuj TBE

  I’m using ffmpeg to create slideshow of images.

  I have to add music in the backgroup which will be played to the size of the slideshow (slicing audio if audio length is greater than video or repeating audio if audio length is shorter than video)

  This is what my script is

  ffmpeg -y \
  
  -loop 1 -i in1.png \
  
  -loop 1 -i in2.png \
  
  -loop 1 -i in3.png \
  
  -loop 1 -i in4.png \
  
  -loop 1 -i in5.png \
  
  -filter_complex \
  
  "[0:v]trim=duration=6,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1,setsar=1:1[v0]; \
  
   [1:v]trim=duration=6,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1,setsar=1:1[v1]; \
  
   [2:v]trim=duration=6,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1,setsar=1:1[v2]; \
  
   [3:v]trim=duration=6,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1,setsar=1:1[v3]; \
  
   [4:v]trim=duration=6,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1,setsar=1:1[v4]; \
  
   [v0][v1][v2][v3][v4]concat=n=5:v=1:a=0,setsar=1:1[v]" -i music.mp3 -shortest -map "[v]" -aspect 16:9 -r 24 shortSlideshow1234.mp4;

  This generates output, but slideshow is silent and there is no music in the video.

• How to mix audio description track into stereo mix in FFMPEG or SOX

  4 mai 2022, par Overlook Motel

  I have a video file with a stereo mix. I have also been provided with an additional audio description track (a narration which describes what's happening on screen for visually-impaired audiences) as a mono WAV.

  


  I am trying to mix the two together, however the tricky part is adjusting the levels. The levels of the main mix should be dipped before and raised back again after each line of speech in the AD track.

  


  The company who produced the AD track have offered to do this for a fee, however I noticed that their fee is static regardless of the length of the film, so I assume it must be an automated process (if it involved a sound mixer in a studio, it'd be charged at a per minute rate).

  


  I'm wondering if it's possible to do this myself in FFMPEG.

  


  The AD track is cleanly recorded at a consistent level and is entirely silent in between the lines of narration. So imagine it would be in principle possible to determine where the main mix needs to go up and down.

  


  Would probably need to :

  


  

  1. Analyse the levels of the AD track and convert to a list of "fade down here", "fade up here" instructions.

  


  2. Apply that list of instructions to the main mix to create an intermediate.

  


  3. Mix together the intermediate with the AD track.

  


  


  The final step could be achieved with the amix filter, but I have little idea how to approach the first 2 steps.

  


  Does anyone know if this is achievable with FFMPEG ? I'd also be open to using other programs such as SOX.