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diff --git a/content/blog/2022-07-30-flac-to-opus.md b/content/blog/2022-07-30-flac-to-opus.md deleted file mode 100644 index 68ee04f..0000000 --- a/content/blog/2022-07-30-flac-to-opus.md +++ /dev/null @@ -1,177 +0,0 @@ -+++ -date = 2022-07-30 -title = "Recursive Command-Line FLAC to Opus Conversion" -description = "Learn how to convert all FLAC files to Opus, including recursive files in subdirectories." -+++ - -## 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 -``` |