flac - 安装使用
文章目录
-
- 报错：Please install 'flac' on ALL worker nodes!
- 安装 flac
- 关于 flac
- flac 命令实例
- flac 选项
-
- Usage:
- general options:
- encoding options:
- format options:
- raw format options:
- negative options:
报错：Please install ‘flac’ on ALL worker nodes!
运行 kaldi - librispeech 时，会报错：
Please install ‘flac’ on ALL worker nodes!
是因为，数据集是flac的压缩格式，而Linux系统没有安装解码的软件，因此需要安装flac。
安装 flac
按如下教程，使用源码安装时，可能会报各种错误
https://blog.csdn.net/rooki_men/article/details/82834864
不妨直接如此安装
sudo apt install flac
macOS 安装 flac
brew install flac
安装成功，测试 查看版本信息
flac --version
关于 flac
- 官网：https://xiph.org/flac/
- flac 特性：https://xiph.org/flac/features.html
- 使用手册：https://xiph.org/flac/documentation_tasks.html
FLAC stands for Free Lossless Audio Codec, an audio format similar to MP3, but lossless, meaning that audio is compressed in FLAC without any loss in quality.
This is similar to how Zip works, except with FLAC you will get much better compression because it is designed specifically for audio, and you can play back compressed FLAC files in your favorite player (or your car or home stereo, see supported devices) just like you would an MP3 file.FLAC stands out as the fastest and most widely supported lossless audio codec, and the only one that at once is non-proprietary, is unencumbered by patents, has an open-source reference implementation, has a well documented format and API, and has several other independent implementations.
FLAC代表免费无损音频编解码器（Free Lossless Audio Codec），一种类似于MP3的音频格式，但无损，这意味着音频在FLAC中被压缩而没有任何质量损失。
这类似于Zip的工作方式，除了FLAC，你会得到更好的压缩，因为它是专门为音频而设计的，你可以像播放MP3文件一样，在你喜欢的播放器（或你的汽车或家庭立体声，请参阅支持的设备）中播放压缩的FLAC文件。
FLAC是最快、支持范围最广的无损音频编解码器，也是唯一一个同时非专利、不受专利限制、具有开源参考实现、格式和API有充分文档记录、以及其他几个独立实现的编解码器。
flac 命令实例
将 wav 文件编码为 flac，指定输出文件：
flac -o path/to/output.flac path/to/file.wav
flac path/to/file.wav
flac 文件解码为 wav，指定输出文件：
flac -d -o path/to/output.wav path/to/file.flac
测试一个 flac 文件的正确编码：
flac -t path/to/file.flac
flac 选项
$ flac -h
===============================================================================
flac - Command-line FLAC encoder/decoder version 1.3.1
Copyright (C) 2000-2009 Josh Coalson
Copyright (C) 2011-2014 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-options>] [<encoding/format-options>] [INPUTFILE [...]]
Decoding: flac -d [<general-options>] [<format-options>] [FLACFILE [...]]
Testing: flac -t [<general-options>] [FLACFILE [...]]
Analyzing: flac -a [<general-options>] [<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
--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 tukey(0.5) -A partial_tukey(2)
-7, --compression-level-7 Synonymous with -l 12 -b 4096 -m -r 6
-A tukey(0.5) -A partial_tukey(2)
-8, --compression-level-8, --best Synonymous with -l 12 -b 4096 -m -r 6
-A tukey(0.5) -A partial_tukey(2) -A punchout_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
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
2023-01-30(周一)