Web lists-archives.com

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
pass=1:bitrate=800:nointerlaced:force_cfr:frameref=3:mixed_refs:bframes=4:b_adapt=2:b_pyramid=normal:weight_b:weightp=1:direct_pred=auto:aq_mode=1:me=umh:me_range=16:subq=7:nombtree:psy_rd=0.8,0.2:chroma_me:trellis=1:cabac:deblock:8x8dct:partitions=p8x8,b8x8,i8x8,i4x4:nofast_pskip:nodct_decimate:threads=auto:keyint=250:keyint_min=25

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:

https://metadata.ftp-master.debian.org/changelogs//main/m/mplayer/mplayer_1.3.0-8_changelog

Any ideas how I get that working on the stretch machine?
-- 
Markus Grunwald
https://www.the-grue.de/~markus/markus_grunwald.gpg