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• FFMPEG - Merge Video-A with audio of of Video-B in a single command ? [duplicate]

  16 avril 2019, par R. Kohlisch

  This question already has an answer here :

  • How to add a new audio (not mixing) into a video using ffmpeg ?
    
    6 answers
    

  I would like to use the video of video A, and put the audio of video B on top. How would I do this with ffmpeg in the command line ? I have found tutorials to do this with extracting the audio first to a wav file, but I was wondering whether it’s possible to do this in a single command ? and without transcoding everything again ?

  edit : both files are .mp4 files and both contain video & audio. both files are of equal length.

• trimming video with FFMPEG, but the output is a black video, with audio

  18 juillet 2017, par riancu

  i have a video, and i want to trim it. This is what I am doing :

  ffmpeg -i input.mp4 -ss 0 -t 4 -vcodec copy -acodec copy output.mp4

  However, output.mp4 only provides me with the correct audio — the video is just a black screen

  I found a similar issue, and someone said to add -pix_fmt yuv420p
  I added it, but nothing changed (did i add it incorrectly ?)

  Any thoughts ?

• How to add background music to a video file on a specific video second ? In node-fluent-ffmpeg

  31 mai 2021, par edpse

  I have a 12sec long audio.mp3 file
and video.mp4 is 60sec long.

  



  I need to insert audio.mp3 on the 40th second of the video.

  



  How to do it with node-fluent-ffmpeg ?