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-#+title: Recursive Command-Line FLAC to Opus Conversion
-#+date: 2022-07-30
-#+description: Learn how to convert all FLAC files to Opus, including recursive files in subdirectories.
-#+filetags: :linux:
-
-* Converting FLAC to OPUS
-I am currently rebuilding my music library from scratch so that I can
-effectively archive all the music I own in the
-[[https://en.wikipedia.org/wiki/FLAC][FLAC file format]], a lossless
-audio codec.
-
-However, streaming FLAC files outside the home can be difficult due to
-the size of the files, especially if you're using a weak connection.
-
-So, in order to archive the music in a lossless format and still be able
-to stream it easily, I opted to create a copy of my FLAC files in the
-[[https://en.wikipedia.org/wiki/Opus_(audio_format)][Opus audio codec]].
-This allows me to archive a quality, lossless version of the music and
-then point my streaming service to the smaller, stream-ready version.
-
-** Dependencies
-The process I follow utilizes the =opus-tools= package in Ubuntu. Before
-proceeding, install the package:
-
-#+begin_src sh
-sudo apt install opus-tools
-#+end_src
-
-If you want to use a different conversion method, such as =ffmpeg= or
-=avconv=, simply install that package instead.
-
-** Conversion Process
-The script I'm using is stored in my home directory, but feel free to
-create it wherever you want. It does not need to be in the same
-directory as your music files.
-
-#+begin_src sh
-cd ~ && nano transform.sh
-#+end_src
-
-Once you have your new bash script opened in an editor, go ahead and
-paste the following logic into the script.
-
-You *MUST* edit the following variables in order for it to work:
-
-- =source=: The source directory where your FLAC files are stored.
-- =dest=: The destination directory where you want the resulting Opus
-  files to be stored.
-
-You *MAY* want to edit the following variables to suit your needs:
-
-- =filename=: If you are converting to a file format other than Opus,
-  you'll need to edit this so that your resulting files have the correct
-  filename extension.
-- =reldir=: This variable can be edited to strip out more leading
-  directories in the file path. As you'll see later, I ignore this for
-  now and simply clean it up afterward.
-- =opusenc=: This is the actual conversion process. You may want to edit
-  the bitrate to suit your needs. I set mine at 128 but some prefer 160
-  or higher.
-
-#+begin_src sh
-#!/bin/bash
-## - The IFS takes care of spaces in file and dirnames
-## - your folders may vary
-## - what you mount to the folders does not matter
-## - in RELDIR, the f5 most likely MUST be edited,
-##    since its responsible, how many leading directories
-##    will be removed from the directory structure in order
-##    to append that exact path to the outfile
-## - the commented echos are still in place in order to give
-##    you the variables for testing, before running.
-
-IFS=$'\n'
-
-## the paths given here contain the directory structure that I want to keep
-## source=/mnt/music/archives/ARTIST/ALBUM/FLACFILE.flac
-## local=/mnt/music/library/ARTIST/ALBUM/OPUSFILE.opus
-
-source=/mnt/music/archives
-dest=/mnt/music/library
-
-for i in $(find $source -type f -iname '*.flac' );
-do
-## SET VARIABLES for PATHS and FILENAMES
-        fullfile=$i
-        filename="${i##*/}"
-        filename="${filename%.*}.opus"
-        fulldir=$(dirname "${i}")
-        reldir="$(echo $fulldir | cut -d'/' -f5-)"
-        reldir=${reldir//flac}
-        outdir="$dest/$reldir"
-        outfile="$outdir/$filename"
-
-# is that working?
-# outfile='$local/""$(echo $(dirname "${i}") | cut -d'/' -f5-)"//flac"/"${i##*/}"'
-#       echo 'output file: ' "$outfile"
-
-## SHOW ME THE CONTENTS of the VARIABLES
-#       echo 'File found:' "$i"
-#       echo 'Relative dir: ' "$reldir"
-#       echo 'directory will be created: ' "$outdir"
-#       echo 'Filename: ' "$filename"
-#       echo 'FileExt: ' "$extension"
-#       echo 'output file: ' "$outfile"
-
-echo "\n\n"
-
-## CREATE Output Folders
-        mkdir -p "$outdir"
-
-## RUN
-# ffmpeg and avconv are alternative options if opusenc isn't adequate
-opusenc --vbr --bitrate 128 --date "$DATE" \
---title "$TITLE" --artist "$ARTIST" --album "$ALBUM" --genre "$GENRE" \
---comment "ALBUMARTIST=$ALBUMARTIST" --comment "DISCNUMBER=$DISCNUMBER" \
---comment "TRACKNUMBER=$TRACKNUMBER" --comment "TRACKTOTAL=$TRACKTOTAL" \
---comment "LYRICS=$LYRICS" "$fullfile" "$outfile"
-
-
-## just for testing
-#        sleep 1
-done
-#+end_src
-
-Once you're done, simply save the file and exit your editor. Don't
-forget to enable execution of the script:
-
-#+begin_src sh
-chmod +x transform.sh
-#+end_src
-
-Finally, you may now run the script:
-
-#+begin_src sh
-./transform.sh
-#+end_src
-
-If you used =opusenc=, you'll see the conversions happen within the
-terminal as it progresses. You will also see variables printed if you
-uncommented any of the bash script's comments.
-
-** Cleanup
-As I noted above, I didn't customize my =reldir= variable in the script,
-which caused my output directory to be =/mnt/music/library/archives=
-instead of =/mnt/music/library=. So, I moved the output up one level and
-deleted the accidental directory.
-
-#+begin_src sh
-cd /mnt/music/library
-mv archives/** .
-rm -rf archives
-#+end_src
-
-** Check the Resulting Size
-If you want to see what kind of file size savings you've gained, you can
-always use the =du= command to check:
-
-#+begin_src sh
-cd /mnt/music
-du -h --max-depth=1 .
-#+end_src
-
-In my case, my small library went from 78GB to 6.3GB!
-
-#+begin_src txt
-78G    ./archives
-6.3G   ./library
-#+end_src