From 74992aaa27eb384128924c4a3b93052961a3eaab Mon Sep 17 00:00:00 2001 From: Christian Cleberg Date: Sat, 27 Apr 2024 17:01:13 -0500 Subject: test conversion back to markdown --- content/blog/2022-07-30-flac-to-opus.md | 178 ++++++++++++++++++++++++++++++++ 1 file changed, 178 insertions(+) create mode 100644 content/blog/2022-07-30-flac-to-opus.md (limited to 'content/blog/2022-07-30-flac-to-opus.md') diff --git a/content/blog/2022-07-30-flac-to-opus.md b/content/blog/2022-07-30-flac-to-opus.md new file mode 100644 index 0000000..fe571bb --- /dev/null +++ b/content/blog/2022-07-30-flac-to-opus.md @@ -0,0 +1,178 @@ ++++ +date = 2022-07-30 +title = "Recursive Command-Line FLAC to Opus Conversion" +description = "" +draft = false ++++ + +# 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 [FLAC file +format](https://en.wikipedia.org/wiki/FLAC), 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 +[Opus audio codec](https://en.wikipedia.org/wiki/Opus_(audio_format)). +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: + +```sh +sudo apt install opus-tools +``` + +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. + +```sh +cd ~ && nano transform.sh +``` + +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. + +```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 +``` + +Once you\'re done, simply save the file and exit your editor. Don\'t +forget to enable execution of the script: + +```sh +chmod +x transform.sh +``` + +Finally, you may now run the script: + +```sh +./transform.sh +``` + +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. + +```sh +cd /mnt/music/library +mv archives/** . +rm -rf archives +``` + +## 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: + +```sh +cd /mnt/music +du -h --max-depth=1 . +``` + +In my case, my small library went from 78GB to 6.3GB! + +``` txt +78G ./archives +6.3G ./library +``` -- cgit v1.2.3-70-g09d2