add cover art to mp3 files (a reality sometimes)

add_cover_mp3.sh

#!/bin/bash
# This will add cover art to all *.mp3 in a directory without transcoding the input file
# requires ffmpeg
# JPEGs will be converted into PNGs

SECONDS=0
COVER=${1}
CMD='ffmpeg'
COUNT=$(ls *.mp3 | wc -l)
COUNTER='1'
NC='\e[0m'
WHITE='\e[1;37m'
YELLOW='\e[1;33m'
LIGHT_BLUE='\e[1;34m'
CYAN='\e[0;36m'
RED='\e[0;31m'

if [ "$1" == "" ]; then
    echo -e "Please enter the path to the cover art. Exiting.\n"
    exit 1
fi

if [[ -e "${COVER}" ]]; then
    echo ""
    echo -e "Cover art file found. Proceeding...\n"
    else
        echo -e "${RED}Cover art file ${WHITE}${COVER}${NC} not found. Exiting.${NC}\n"
        exit 2
fi

if ! [ -x "$(command -v ${CMD})" ]; then
    echo "${RED}Error: ${CMD} is not installed. Please install ${CMD}. Exiting.${NC}" >&2
    exit 3
    else
        echo -e "${CMD} found. Proceeding...\n"
fi

if [ "$COUNT" == "0" ]; then
    echo -e "${RED}No .mp3 files found. Exiting.${NC}\n"
    exit 4
fi

displaytime () {
    local T=$SECONDS
    local D=$((T/60/60/24))
    local H=$((T/60/60%24))
    local M=$((T/60%60))
    local S=$((T%60))
    [[ $D > 0 ]] && printf '%d days ' $D
    [[ $H > 0 ]] && printf '%d hours ' $H
    [[ $M > 0 ]] && printf '%d minutes ' $M
    [[ $D > 0 || $H > 0 || $M > 0 ]] && printf 'and '
    printf '%d seconds\n' $S
}

echo -e "Adding ${WHITE}${COVER}${NC} to ${WHITE}${COUNT}${NC} .mp3 audio files...\n"

for f in *.mp3 ; do
    echo ""
    echo -e "Updating file ${WHITE}\"${f}\"${NC} ... ${COUNTER}/${COUNT}\n"
    ffmpeg -i "${f}" \
    -i "${COVER}" \
    -map 0:0 \
    -map 1:0 \
    -c copy \
    -id3v2_version 3 \
    -metadata:s:v title="Album cover" \
    -metadata:s:v comment="Cover (front)" \
    "new-${f}" \
    -hide_banner
    -loglevel panic # decrease stdout verbosity
    (( COUNTER++ ))
done
    
#read -n 1 -s -r -p "Press any key to continue"
echo ""

echo -e "Deleting original files...\n"

for name in "./!(new-*.mp3)" ; do
    echo -e "Deleting ${name}...\n"
    [ -f "$name" ] && rm -v "$name"
done

echo -e "Renaming new files back to original file names...\n"
for n in new-*.mp3 ; do
    echo ""
#    echo -e "Renaming ${n}...\n"
    mv -v "$n" "$(echo "$n" | sed s/new-//)"
done

TIME=$(displaytime)
echo ""
echo -e "Completed in ${YELLOW}${TIME}${NC}.\n"

exit 0