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Recursively mirror a directory tree of FLAC audio files to AAC/OGG/MP3. Source files can be filtered (by sub-directory, or full path) in order to limit the files converted. The script will also attempt to retain all meta-data fields in the output files.
At a Glance
- Mirror directory tree of FLAC files audio files to AAC/OGG/MP3 (re-encoded using NeroAacEnc, oggenc, or LAME).
- Filter source tree using one or more sub-directory paths.
- By default, will only re-encode missing or out-of-date AAC/OGG/MP3 files.
- Optionally deletes orphaned output files.
- Multi-threaded encoding ensures full CPU utilization.
- Supports transfer of FLAC meta-data including title, artist, album.
- Converts FLAC replaygain field to Apple iTunes Sound Check.
- Optionally resizes and embeds album cover art JPEG files to destination files.
- Optionally copy cover art to destination directories.
Usage Model
- Hard disk space is cheap, but flash-based media players are still limited in capacity.
- Create a lossy encoded "mirror" of your music files for portability.
- Setup a daily cron job to always keep your FLAC and AAC/OGG files synchronized.
- Re-encode your FLAC library to different AAC/OGG bit-rates in one command.
Running and Options
Flacsync is run from the command-line, using the following format.
flacsync [options] BASE_DIR [SOURCE ...]
BASE_DIR
Define the root path of a directory hierarchy containing desired input files (FLAC). A mirrored output directory will be created in the deepest path, parallel to BASE_DIR, and named after the selected output file extension.
For example, if BASE_DIR is /data/flac, the output dir will be /data/aac.
SOURCE ...
Optional dir/file argument list to select source files for transcoding. If not defined, all files in BASE_DIR will be transcoded. The SOURCE file/dir list must be relative from BASE_DIR or the current working directory.
| --version | show program's version number and exit |
| -h, --help | show this help message and exit |
| -c THREAD_COUNT, --threads=THREAD_COUNT | |
| set max number of encoding threads [default:2] | |
| -f, --force | force re-encode of all files from the source dir; by default source files will be skipped if it is determined that an up-to-date copy exists in the destination path |
| -t ENC_TYPE, --type=ENC_TYPE | |
| select the output transcode format; supported values are 'aac','ogg','mp3' [default:aac] | |
| -o, --ignore-orphans | |
| prevent the removal of files and directories in the dest dir that have no corresponding source file | |
| -d DEST_DIR, --destination=DEST_DIR | |
| define alternate destination output directory to override the default. The standard default destination directory will be created in the same parent directory of BASE_DIR. See BASE_DIR above. | |
| -r, --resize | enable resizing of cover art; by default the art that is found will be saved to file without resizing. |
| -j, --copy-cover-art | |
| in addition to embedding cover art, copy image file directly to the desination sub-folder. | |
AAC Encoder Options:
-q AAC_Q, --aac-quality=AAC_Q set the AAC encoder quality value, must be a float range of 0..1 [default:0.35]
OGG Encoder Options:
-g OGG_Q, --ogg-quality=OGG_Q set the Ogg Vorbis encoder quality value, must be a float range of -1..10 [default:5]
MP3 Encoder Options:
-m MP3_Q, --mp3-quality=MP3_Q set the Lame MP3 encoder quality value, must be a initeger range of 0..9 [default:3]
Examples
Encode a directory of FLAC files to AAC. Output file will be written to /music/aac.
flacsync /music/flac cd /music/flac; flacsync .
Encode a directory of FLAC files to AAC. Output files will be written to /ipod.
flacsync -d /ipod /music/flac
Encode a directory of FLAC files to high-quality OGG, using 4 CPU threads.
flacsync -c 4 -t ogg -g 9 /music/flac
Force re-encode two albums of FLAC files, even if the AAC files exist.
flacsync -f /music/flac artist1/album artist2/album cd /music/flac; flacsync -f . artist1/album artist2/album
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