How can I add a new audio track to an x265 MP4 video without re-encoding it?

Question

I would've tried MKVMerge or MakeMKV but they won't work on MP4 files. Does anyone have a way to just add the track? Cause adding it via Handbrake or something would take too much time.

Thanks.

Gyan · Answer 1 · 2017-01-10T06:25:40.670

2

You can use ffmpeg, a free command-line tool.

Syntax would be

ffmpeg -i video.mp4 -i audio.mp3 -c copy -map 0 -map -0:d -map 1 new.mp4

edited Jan 10 '17 at 06:25

answered Jan 08 '17 at 16:27

Gyan

38,955

How can I add a new audio track to an x265 MP4 video without re-encoding it?

1 Answers1