Butchered audio track

[MickM]

I'm trying to find any reliable way to batch convert my library of DVD VOB movies to MKV and am having an awful time :-(.  When I convert a foreign language movie, the second audio track (English) is all choppy and messed up - I see hundreds of error lines like:

 [refill] 20:49:16-006  Trying to ignore the discontinuous timestamp (1 try)
[audioClock] Drift detected :6924568633 vs 6924584633, delta=16000
[audioClock] Drift detected :6924616633 vs 6924632633, delta=16000
 [refill] 20:49:16-006  Trying to ignore the discontinuous timestamp (1 try)
[AudioStream] Warning skew in dts =+ 48000
[AudioStream] Warning skew lastDts=01:55:24,680
[AudioStream] Warning skew newDts=01:55:24,728 
[audioClock] Drift detected :6924664633 vs 6924728633, delta=64000
[audioClock] Drift detected :6924760633 vs 6924776633, delta=16000
[audioClock] Drift detected :6924808633 vs 6924824633, delta=16000

If I convert the same movie to MKV using MKVToolnix then all the audio tracks are just fine, so I believe this is a bug in avidemux. I'm happy to upload the movie or one of the VOBs inside it to a server somewhere so this can be debugged.

On a separate front, does anybody know of any robust software that runs on a Mac (which really limits the choices) that I can use to do my batch VOB to MKV conversions? I already know both avidemux and mkvtoolnix currently have killer bugs that make this impossible. For mkvtoolnix, the author has already said he abandoned any further VOB support years ago...

[eumagga0x2a]

Do you experience the issue when using the latest nightly build for macOS?

https://avidemux.org/nightly/osx_catalina/