The new audio file in the video will start at the exact moment that the old one did, so you’ll want to match them. I find it often easier on macOS to drag the file locations to terminal map 0:v:0 - This is a complicated option that specifies that we want to take the video from the first stream and the audio from the 2nd stream vcodec copy - this means keep the video codec from the source file acodec copy - this means keep the audio codec from the source file Don’t want to read a whole article? The short answer is install FFMPEG and use this command: ffmpeg -i source_video.mp4 -i source_audio.wav -acodec copy -vcodec copy -map 0:v:0 -map 1:a:0 final_video.movįFMPEG is a a terminal program, so you’ll need to go to the Utillities folder inside of the applications folder and install homebrewįrom there you can enter the command like so: ffmpeg -i /path/to/movie/file.mp4 -i /path/to/audio/file.wav -acodec copy -vcodec copy -map 0:v:0 -map 1:a:0 combined_file.mov This is very useful as a way to avoid loss of quality for the video. To replace audio in a video without having to re-encode the video you can use a tool called ffmpeg.
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