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flac often spelled FLAC which stands for Free Lossless Audio Codec. It is designed to compress audio in a lossless manner, that is without loosing information relative to the source. Depending upon the contents of the original, FLAC is 50% to 70% smaller than an uncompressed original. FLAC is well regarded among audiophiles and audio professionals.

FLAC may optionally use an OGG container.


USE flags

USE flags for media-libs/flac Free lossless audio encoder and decoder

cxx Build support for C++ (bindings, extra libraries, code generation, ...)
debug Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
ogg Add support for the Ogg container format (commonly used by Vorbis, Theora and flac)
static-libs Build static versions of dynamic libraries as well


root #emerge --ask media-libs/flac



user $flac --help
flac - Command-line FLAC encoder/decoder version 1.4.2
Copyright (C) 2000-2009  Josh Coalson
Copyright (C) 2011-2022  Xiph.Org Foundation

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 Encoding: flac [<general/encoding/format options>] [INPUTFILE [...]]
 Decoding: flac -d [<general/decoding/format options>] [FLACFILE [...]]
  Testing: flac -t [<general options>] [FLACFILE [...]]
Analyzing: flac -a [<general/analysis options>] [FLACFILE [...]]

Be sure to read the list of known bugs at:

general options:
  -v, --version                Show the flac version number
  -h, --help                   Show this screen
  -H, --explain                Show detailed explanation of usage and options
  -d, --decode                 Decode (the default behavior is to encode)
  -t, --test                   Same as -d except no decoded file is written
  -a, --analyze                Same as -d except an analysis file is written
  -c, --stdout                 Write output to stdout
  -s, --silent                 Do not write runtime encode/decode statistics
      --totally-silent         Do not print anything, including errors
      --no-utf8-convert        Do not convert tags from local charset to UTF-8
  -w, --warnings-as-errors     Treat all warnings as errors
  -f, --force                  Force overwriting of output files
  -o, --output-name=FILENAME   Force the output file name
      --output-prefix=STRING   Prepend STRING to output names
      --delete-input-file      Deletes after a successful encode/decode
      --preserve-modtime       Output files keep timestamp of input (default)
      --keep-foreign-metadata  Save/restore WAVE or AIFF non-audio chunks
      --keep-foreign-metadata-if-present  Save/restore WAVE or AIFF non-audio
                        but not return an error when no such chunks are found
      --skip={#|mm:ss.ss}      Skip the given initial samples for each input
      --until={#|[+|-]mm:ss.ss}  Stop at the given sample for each input file
      --ogg                    Use Ogg as transport layer
      --serial-number          Serial number to use for the FLAC stream
analysis options:
      --residual-text          Include residual signal in text output
      --residual-gnuplot       Generate gnuplot files of residual distribution
decoding options:
  -F, --decode-through-errors  Continue decoding through stream errors
      --cue=[#.#][-[#.#]]      Set the beginning and ending cuepoints to decode
encoding options:
  -V, --verify                 Verify a correct encoding
      --lax                    Allow encoder to generate non-Subset files
      --ignore-chunk-sizes     Ignore data chunk sizes in WAVE/AIFF files
      --sector-align (DEPRECATED) Align multiple files on sector boundaries
      --replay-gain            Calculate ReplayGain & store in FLAC tags
      --cuesheet=FILENAME      Import cuesheet and store in CUESHEET block
      --picture=SPECIFICATION  Import picture and store in PICTURE block
  -T, --tag=FIELD=VALUE        Add a FLAC tag; may appear multiple times
      --tag-from-file=FIELD=FILENAME   Like --tag but gets value from file
  -S, --seekpoint={#|X|#x|#s}  Add seek point(s)
  -P, --padding=#              Write a PADDING block of length #
  -0, --compression-level-0, --fast  Synonymous with -l 0 -b 1152 -r 3
  -1, --compression-level-1          Synonymous with -l 0 -b 1152 -M -r 3
  -2, --compression-level-2          Synonymous with -l 0 -b 1152 -m -r 3
  -3, --compression-level-3          Synonymous with -l 6 -b 4096 -r 4
  -4, --compression-level-4          Synonymous with -l 8 -b 4096 -M -r 4
  -5, --compression-level-5          Synonymous with -l 8 -b 4096 -m -r 5
  -6, --compression-level-6          Synonymous with -l 8 -b 4096 -m -r 6
                                         -A subdivide_tukey(2)
  -7, --compression-level-7          Synonymous with -l 12 -b 4096 -m -r 6
                                         -A subdivide_tukey(2)
  -8, --compression-level-8, --best  Synonymous with -l 12 -b 4096 -m -r 6
                                         -A subdivide_tukey(3)
  -b, --blocksize=#                  Specify blocksize in samples
  -m, --mid-side                     Try mid-side coding for each frame
  -M, --adaptive-mid-side            Adaptive mid-side coding for all frames
  -e, --exhaustive-model-search      Do exhaustive model search (expensive!)
  -A, --apodization="function"       Window audio data with given the function
  -l, --max-lpc-order=#              Max LPC order; 0 => only fixed predictors
  -p, --qlp-coeff-precision-search   Exhaustively search LP coeff quantization
  -q, --qlp-coeff-precision=#        Specify precision in bits
  -r, --rice-partition-order=[#,]#   Set [min,]max residual partition order
      --limit-min-bitrate            Limit minimum bitrate (for streaming)
format options:
      --force-raw-format       Treat input or output as raw samples
      --force-aiff-format      Force decoding to AIFF format
      --force-rf64-format      Force decoding to RF64 format
      --force-wave64-format    Force decoding to Wave64 format
raw format options:
      --endian={big|little}    Set byte order for samples
      --channels=#             Number of channels
      --bps=#                  Number of bits per sample
      --sample-rate=#          Sample rate in Hz
      --sign={signed|unsigned} Sign of samples
      --input-size=#           Size of the raw input in bytes
negative options:



root #emerge --ask --depclean --verbose media-libs/flac

See also