generate m3u from directory

mkm3u.sh

#!/usr/bin/env sh

# generates extended m3u for all media files in a directory.
#
# requirements: ffprobe (ffmpeg)
# usage: $0 path/to/media/files [playlist.m3u]
# author: mail@glasz.org
# license: wtfpl - http://www.wtfpl.net/txt/copying/

set -e

if [ ! -d "$1" ]; then
  echo "first argument must be a directory"
  echo "usage: $0 directory [index.m3u]"
  exit 1
fi

path="$1"
name=${2:-"index.m3u"}
m3u="$path/$name"
dotm3u="$path/.$name"

echo "#EXTM3U" > "$dotm3u"
echo "" >> "$dotm3u"

ls "$path" | while IFS= read -r f; do
  if [ "$name" == "$f" ]; then continue; fi

  i=$(ffprobe -v 0 -of json -show_format "$path/$f" | jq '.format')
  a=$(echo "$i" | jq -r '.tags.artist')
  t=$(echo "$i" | jq -r '.tags.title')
  l=$(echo "$i" | jq -r '.duration | tonumber | ceil')

  echo "#EXTINF:$l,$a - $t" >> "$dotm3u"
  echo "$f" >> "$dotm3u"
  echo "" >> "$dotm3u"
done

rm -f "$m3u" && mv "$dotm3u" "$m3u"