Mkvmerge

find *.mkv -type f -print | {
  while read filename ; do
    # echo ${filename}
    mkvmerge --output "/mnt/d/Temp/!Converted/${filename}" \
        --language 0:jpn --default-track 0:yes \
        --language 1:jpn --default-track 1:yes "${filename}" \
        --language 0:rus "./RUS Sound/[Azazel & Mai & Stefan]/${filename%.mkv}.mka" \
        --language 0:rus "./RUS Sub [Saptrans] & [Viper]/${filename%.mkv}.ass" \
        --track-order 0:0,0:1,1:0,2:0
  done
}