@echo off
::
:: ----------------------------------------------------
:: Conversion of all file in current folder 
:: from audui 6.1 to stereo with focus on central channel
:: ----------------------------------------------------
::
:: More information:  https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg
:: FFMPEG dowbkiad : https://ffmpeg.org/download.html
:: 
:: Remember to add path to FFMPEG below in PATH env!
::

SET PATH=%PATH%;D:\Program Files\ffmpeg-2021-01-24-git-1775688292-full_build\bin;



cls
echo Conversion of all files below!
echo.
dir /b
echo.
echo Conversion of all files above. Press CTRL+C to abort!
pause



@echo off
mkdir OUT_Stereo

    for %%f in (*.*) do (
    echo "%%f"
    echo "OUT_Stereo\%%~nf.mp3"
    ffmpeg -i "%%f"  -c:v copy -acodec ac3 -ac 2 -af "pan=stereo|FL=1.5*FC+0.40*FL+0.40*BL+0.1*LFE|FR=1.5*FC+0.40*FR+0.40*BR+0.1*LFE" "OUT_Stereo\%%~nf_lektor_OK%%~xf" 
)