// this is a terminal command to run in the same folder as a bunch of MP3 you want to convert so they work with Alexa. Requires that FFMpeg is installed.

printf "%s\0" * | xargs -0 -I {} ffmpeg -y -i {} -ac 2 -codec:a libmp3lame -b:a 48k -ar 16000 converted_{}

// it prepends the string "converted_" to the output files.