Alias to convert a stereo recording to mono

qtmono.sh

# Alias to convert a stereo recording to mono
#
# $1 - The input filename
function qtmono {
        basename=$(basename "$1")
        filename="${basename%.*}"
        extension="${basename##*.}"

        ffmpeg -i $1 -codec:v copy -af pan="mono: c0=FL" $filename-mono.$extension
}

If you get Error applying option ‘c0’ to filter ‘pan’: Option not found try this version (2024, Sonoma)

function qtmono {
    basename=$(basename "$1")
    filename="${basename%.*}"
    extension="${basename##*.}"
    ffmpeg -i $1 -ac 1 $filename-mono.$extension
}

This is great! Thanks. The conversion is slower than when using the first implementation, but that solution decreases the file size. The files are 10x smaller for me, and the quality is still outstanding.