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Why does sound encoded with mencoder crackle in debian stretch but not in buster?

I'm transcoding some TV Series with mencoder. I wrote a script where the
core is:

mencoder 00001.ts -o 00001.avi -passlogfile /tmp/tmp.VQ6WZm1tSo/pass.log
-demuxer lavf -nosub -vf softskip,harddup -aspect 16:9 -aid 0 -oac lavc
-lavcopts acodec=ac3:abitrate=128 -ovc x264 -x264encopts

This is probably the only interesting part for this post:

-oac lavc -lavcopts acodec=ac3:abitrate=128

I wrote that script on my laptop, a debian buster machine. Everything is
fine here. But when I let the script run on the machine where all the
recordings are stored (a debian stretch machine), the sound is
disturbed. Some kind of ~6Hz crackle. Video is ok.

IMHO it has to do with some different version of a binary or library.
That's why I tried it with different audio encoder:

-oac mp3lame -lameopts preset=medium

Still the same.

The versions for mencoder differ a tiny bit on both machines:

ii  mencoder       2:1.3.0-6    amd64        MPlayer's Movie Encoder
ii  mencoder       2:1.3.0-8+b4 amd64        MPlayer's Movie Encoder

But the differences seem quite minor:


Any ideas how I get that working on the stretch machine?
Markus Grunwald