ydl-audio

#! /bin/bash

YTUBE_LINK="$1"
AUDIO_FORMAT=140  # m4a
# AUDIO_FORMAT=171  # vorbis
# AUDIO_FORMAT=250  # opus (webm)
YTUBE_DIR=~/Downloads/youtubex
VOL2_DIR=$YTUBE_DIR/volume2
CMD_YTUBE="youtube-dl --restrict-filenames"

cd $YTUBE_DIR || echo "Error: youtube directory '$YTUBE_DIR' not found" && exit 2

FNAME=$($CMD_YTUBE --get-filename -f $AUDIO_FORMAT $YTUBE_LINK)
$CMD_YTUBE --no-mtime -f $AUDIO_FORMAT $YTUBE_LINK
errNum=$?
if (( $errNum )) ; then
    test -f $FNAME && rm -i $FNAME
    exit $errNum
fi

# If a VOL2 directory exists, proceed with audio boosting.
if [[ -d $VOL2_DIR ]] ; then
    if [[ ! -x $(which ffmpeg) ]] ; then
        echo "Error: command ffmpeg not found"
        exit 127
    fi

    V2_NAME=$VOL2_DIR/${FNAME%.*}.ogg
    ffmpeg -loglevel warning -i $FNAME -vn -af volume=2.2 $V2_NAME
    errNum=$?
    if (( ! $errNum )) ; then
        echo "All OK - err: $errNum"
        rm -i $FNAME
    else
        echo "Bad thing - err: $errNum"
        if [[ -f $V2_NAME ]] ; then
            rm -i $V2_NAME
        fi
        exit $errNum
    fi
fi