flac
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Resources
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.
Installation
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 |
Emerge
root #emerge --ask media-libs/flacUsage
Invocation
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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.
===============================================================================
Usage:
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:
http://xiph.org/flac/documentation_bugs.html
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:
--no-adaptive-mid-side
--no-cued-seekpoints
--no-decode-through-errors
--no-delete-input-file
--no-error-on-compression-fail
--no-preserve-modtime
--no-keep-foreign-metadata
--no-exhaustive-model-search
--no-lax
--no-mid-side
--no-ogg
--no-padding
--no-qlp-coeff-prec-search
--no-replay-gain
--no-residual-gnuplot
--no-residual-text
--no-ignore-chunk-sizes
--no-sector-align
--no-seektable
--no-silent
--no-force
--no-verify
--no-warnings-as-errors
Removal
Unmerge
root #emerge --ask --depclean --verbose media-libs/flac