archive_extractor

#!/bin/sh -eu

ref_date="`date -Is -d "$1"`"
archive=~/archive/
artist=${artist-Instanssiradio `date +%Y`}

arch_file=`{
    ls -U $archive
    echo $ref_date
} | sort | grep -B 1 -x -- "$ref_date" | head -n 1`

arch_start=$(date +%s -d "`basename $arch_file .opus`")

cut_start=$(( `date +%s -d "$1"` - $arch_start))
cut_end=$(( `date +%s -d "$2"` - $arch_start))

# Generate safe filename based on the track name
outfile="`date -d "$1" '+%FT%R'`-`echo "$3" | iconv -f utf-8 -t ascii//TRANSLIT | tr '[:upper:]' '[:lower:]' |sed -sr -e 's/[^a-z0-9]+/-/g' -e 's/^-*//' -e 's/-*$//'`.opus"

echo "From:         `date -d "$1"`"
echo "To:           `date -d "$2"`"
echo "Source file:  $arch_file"
echo "Cut start:    $cut_start seconds"
echo "Cut end:      $cut_end seconds"
echo "Title:        $3"
echo "Target file:  $outfile"
echo
nice ffmpeg -nostdin -i "$archive/$arch_file" -ss $cut_start -to $cut_end -c copy -metadata title="$3" -metadata "artist=$artist" "file:$outfile"