Hervé ANSELME via ffmpeg-user (HE12025-10-29):
> ffmpeg -i "source movie" -y -loglevel error -sn ^
> -map 0:m:language:fre -acodec aac -ar 48k -b:a 192k ^
> -map 0:m:language:eng -acodec aac -ar 48k -b:a 128k -ac 6 -channel_layout 5.1 
> -mapping_family:a 255 ^
> -map 0:v:0 -vcodec libsvtav1 "destination movie"
> 
> in order to encode differently the selected audio tracks.

You seem to be working under the assumption that the order of the
parameters is what matters. It is not. The options you think apply to
one stream but not the other actually apply either to both or to none.
You need to use stream specifiers.

Regards,

-- 
  Nicolas George
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