#!/bin/zsh

TARGET=$1

if [[ -e $TARGET.mkv ]]; then
    ffmpeg -i $TARGET.mkv -n $TARGET.mp3
    rm $TARGET.mkv
elif [[ -e $TARGET.webm ]]; then
    ffmpeg -i $TARGET.webm -n $TARGET.mp3
    rm $TARGET.webm
elif [[ -e $TARGET.mp4 ]]; then
    ffmpeg -i $TARGET.mp4 -n $TARGET.mp3
    rm $TARGET.mp4
else
    echo "file not found"
fi