I'm not *sure* of the following fact but I prefer explain it in the forum.
I'm using avidemux 2.7.4 in debian stable (buster) 10.6.
It *seems* to me that at least that version fails in generating mp4v2
(when seeing the mp4 on a TV set, there are numerous "clac" sounds,
evidently not present in the mkv source).
However, when seeing the mp4 video on a computer, eg with vlc,
there are no "clac" sounds.
But this problem is not present when generating mp4.
I *think* that older versions did not fail that way.
Quote from: daniel_duparc on September 29, 2020, 06:55:09 AMBut this problem is not present when generating mp4.
This amounts to "everything is fine". The MP4v2 (libmp4v2) muxer is deprecated, Avidemux 2.7.4 is unsupported legacy version.
I strongly recommend updating to a current version (2.7.7 git master), there were numerous improvements especially in handling of timing in mp4 during 2.7.6 development cycle.
Thank you