How to add audio track to MP4?

[arekbulski]

I need a quick advise: can I use this library to modify a MP4 by adding (or replacing) an audio track? If so, would it reencode?

[Zulko]

If this is the only thing you need to do, then ffmpeg will do that faster and without reencoding.

in moviepy you can do it with:

myclip.audio = AudioFileClip("some_soundtrack.mp3")

[arekbulski]

So the one-liner using moviepy would require re-encoding, right? Could you point me to some existing ffmpeg discussion/solution? I am not very proficient with ffmpeg options.

[Zulko]

yes the moviepy solution involves reencoding. I cant help you with ffmpeg but it should be easy enough to find out, it is a common use case.

Note that for this kind of questions forums like stackoverflow or reddit/moviepy are better than github issues (which we keep for bug reports or feature requests).

[arekbulski]

Thank you!