I have a short MP4 video (with sound), and a separate short MP3 file. I am looking for a way to replace the audio of the first file with the audio of the second one.

Is there an online service that I might use for that task, and if not, what is the most lightweight app solution for doing it on a Mac?

Cross-posted at Ask Different.

  • I am adding this as a comment as I am not entirely sure if it is feasible, but look at FFMPeg CLI :) Should be possible – DankyNanky Jan 22 '17 at 3:15

Solved by installing ffmpeg and following this answer to map the video and audio files.

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