Merge Video and Audio with FFmpeg

Install FFmpeg (if not already installed):

• Linux:
  sudo apt-get install ffmpeg
• MacOS:
  brew install ffmpeg
• Windows: Download from ffmpeg.org

Prepare your files

Place your files in one folder, for example:

• video.mp4
• audio.mp3

Then open a command prompt or terminal in that folder.

Merge video and audio

Run this command:

ffmpeg -i video.mp4 -i audio.mp3 -c:v copy -c:a aac -shortest output.mp4

• -c:v copy
  keeps the video stream without re-encoding.
• -c:a aac
  encodes audio in an MP4-compatible format.
• -shortest
  ends output when the shorter stream ends.

If your audio is longer than your video, the result will not run longer than needed.