adding audio

[aeon1]

Hi,

How to add another audio track, from external file, to already existing mp4 video file?
The problem is that the video file has two subtitle tracks, neither burned-in nor external .srt files.
Avidemux works very well for adding the track but removes subtitles.

If possible, I want is to keep video, audio and subtitles intact.

[butterw]

if you don't mind muxing to .mkv: mkvtoolnix. Otherwise ffmpeg (but it's command line).

[aeon1]

ok, I've figured it all out with ffmpeg.
such a great tool