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Difference between revisions of "Converting audios"

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'''Converting audio files''' is a frequently needed task when serving audio files to target services and users.
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= How to convert large batch of audios ? =
 
= How to convert large batch of audios ? =
 
== Dependencies ==
 
== Dependencies ==
 +
:''<span style="color:#B10000">Warning : <code>avconv</code> have been removed from Ubuntu packages since 18.04. Use ffmpeg instead.</span>''
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
−
sudo apt-get install lame avconv
+
sudo apt-get install lame ffmpeg
 
man lame                          # then search for parameters via "/{param}". ex: /-m
 
man lame                          # then search for parameters via "/{param}". ex: /-m
 
</syntaxhighlight>
 
</syntaxhighlight>
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== Helpers ==
 
== Helpers ==
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
−
mkdir -p ./new/                     # create folder, if not existing (-p)
+
$ mkdir -p ./new/                   # create folder, if not existing (-p)
−
file="./dir/audio-0a6f36g.flac"     # path to .flac file into varible &quot;$file&quot;
+
$ file="./data/cmn-0a0a8a8b.flac"   # path to .flac file into varible &quot;$file&quot;
−
avconv -i "$file" 2>1              # print out metadata of $file, for some formats only
+
$ ffprobe -hide_banner "$file"       # print out metadata of $file, for some formats only
 +
 
 +
$ ffprobe -hide_banner ./data/cmn-0a0a8a8b.ogg
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Input #0, ogg, from './data/cmn-0a0a8a8b.ogg':
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  Duration: 00:00:01.25, start: 0.000000, bitrate: 99 kb/s
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  Stream #0:0: Audio: vorbis, 44100 Hz, mono, fltp, 80 kb/s
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    Metadata:
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      TITLE          : 高低
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      LICENSE        : Creative Commons BY-SA 3.0 U.S
 +
      COPYRIGHT      : (c) 2009 Yue Tan
 +
      ARTIST          : Tan
 +
      DATE            : 2009-07-08
 +
      GENRE          : Speech
 +
      SWAC_LANG      : cmn
 +
      SWAC_TEXT      : 高低
 +
      SWAC_ALPHAIDX  : gāodī
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      SWAC_SPEAK_NAME : Tan
 +
      SWAC_SPEAK_GENDER: F
 +
      SWAC_SPEAK_BIRTH_YEAR: 1978
 +
      SWAC_SPEAK_LANG : zho
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      SWAC_SPEAK_LANG_REGION: Liaoning
 +
      SWAC_SPEAK_LIV_COUNTRY: FR
 +
      SWAC_SPEAK_LIV_TOWN: Caen
 +
      SWAC_PRON_PHON  : gāodī
 +
      SWAC_COLL_SECTION: HSK niveau IV
 +
      SWAC_COLL_LICENSE: Creative Commons BY-SA 3.0 U.S
 +
      SWAC_COLL_COPYRIGHT: (c) 2009 Yue Tan
 +
      SWAC_TECH_DATE  : 2009-07-08
 +
      SWAC_TECH_SOFT  : Shtooka Recorder/1.3
 
</syntaxhighlight>
 
</syntaxhighlight>
  
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== Metadata-based format conversion ==
 
== Metadata-based format conversion ==
−
This example works on SWAC recorder audio files having the <code>SWAC_TEXT</code> metadata field. In this exemple, we assume a folder with file <code>audio-0a6f36g.flac</code> and metadata <code>SWAC_TEXT    : 很</code>.
+
This example works on SWAC recorder audio files available at https://packs.shtooka.net. Those files contain rich metadata, with a <code>SWAC_TEXT</code> metadata field. In this example, we assume a folder with file <code>audio-0a6f36g.flac</code> and metadata <code>SWAC_TEXT    : 很</code>.
  
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
for file in ./flac/*.flac
 
for file in ./flac/*.flac
 
do
 
do
−
   key=$(avconv -i "$file" 2>&1 | sed -ne 's/.*SWAC_TEXT *: //p')                # print metadata, assign SWAC_TEXT's value to variable.
+
   key=$(ffmpeg -i "$file" 2>&1 | sed -ne 's/.*SWAC_TEXT *: //p')                # print metadata, assign SWAC_TEXT's value to variable.
 
   lame --abr 24    -m m -h --resample 22.05 "$file" "./new-24k/cmn-$key.mp3";    # ex: cmn-很.mp3 (24k abr)
 
   lame --abr 24    -m m -h --resample 22.05 "$file" "./new-24k/cmn-$key.mp3";    # ex: cmn-很.mp3 (24k abr)
 
   lame --cbr -b 96 -m m -h --resample 22.05 "$file" "./new-96k/cmn-$key.mp3";    # ex: cmn-很.mp3 (96k cbr)
 
   lame --cbr -b 96 -m m -h --resample 22.05 "$file" "./new-96k/cmn-$key.mp3";    # ex: cmn-很.mp3 (96k cbr)
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== See also ==
 
== See also ==
 
* [[:c:Commons:Audio]]
 
* [[:c:Commons:Audio]]
−
{{LinguaLibre scripts}}
+
{{Technicals}}
  
 
[[Category:Lingua Libre:Help{{#translation:}}]]
 
[[Category:Lingua Libre:Help{{#translation:}}]]

Latest revision as of 17:14, 4 January 2024

Converting audio files is a frequently needed task when serving audio files to target services and users.

How to convert large batch of audios ?

Dependencies

Warning : avconv have been removed from Ubuntu packages since 18.04. Use ffmpeg instead.
sudo apt-get install lame ffmpeg
man lame                           # then search for parameters via "/{param}". ex: /-m

Technolect

  • cbr: constant bit rate.
  • abr: average bit rate.
  • vbr: variable bit rate.

For more, see man lame.

Helpers

$ mkdir -p ./new/                    # create folder, if not existing (-p)
$ file="./data/cmn-0a0a8a8b.flac"    # path to .flac file into varible &quot;$file&quot;
$ ffprobe -hide_banner "$file"       # print out metadata of $file, for some formats only

$ ffprobe -hide_banner ./data/cmn-0a0a8a8b.ogg
Input #0, ogg, from './data/cmn-0a0a8a8b.ogg':
  Duration: 00:00:01.25, start: 0.000000, bitrate: 99 kb/s
  Stream #0:0: Audio: vorbis, 44100 Hz, mono, fltp, 80 kb/s
    Metadata:
      TITLE           : 高低
      LICENSE         : Creative Commons BY-SA 3.0 U.S
      COPYRIGHT       : (c) 2009 Yue Tan
      ARTIST          : Tan
      DATE            : 2009-07-08
      GENRE           : Speech
      SWAC_LANG       : cmn
      SWAC_TEXT       : 高低
      SWAC_ALPHAIDX   : gāodī
      SWAC_SPEAK_NAME : Tan
      SWAC_SPEAK_GENDER: F
      SWAC_SPEAK_BIRTH_YEAR: 1978
      SWAC_SPEAK_LANG : zho
      SWAC_SPEAK_LANG_REGION: Liaoning
      SWAC_SPEAK_LIV_COUNTRY: FR
      SWAC_SPEAK_LIV_TOWN: Caen
      SWAC_PRON_PHON  : gāodī
      SWAC_COLL_SECTION: HSK niveau IV
      SWAC_COLL_LICENSE: Creative Commons BY-SA 3.0 U.S
      SWAC_COLL_COPYRIGHT: (c) 2009 Yue Tan
      SWAC_TECH_DATE  : 2009-07-08
      SWAC_TECH_SOFT  : Shtooka Recorder/1.3

Simple batch format conversion

for file in ./flac/*.flac
do
  key=$(basename "$file" .flac).mp3                                 # name of the file minus .flac, plus .mp3 
  lame --abr 24    -m m -h --resample 22.05 "$file" "./new/$key";
done

Metadata-based format conversion

This example works on SWAC recorder audio files available at https://packs.shtooka.net. Those files contain rich metadata, with a SWAC_TEXT metadata field. In this example, we assume a folder with file audio-0a6f36g.flac and metadata SWAC_TEXT : 很. 

for file in ./flac/*.flac
do
  key=$(ffmpeg -i "$file" 2>&1 | sed -ne 's/.*SWAC_TEXT *: //p')                 # print metadata, assign SWAC_TEXT's value to variable.
  lame --abr 24    -m m -h --resample 22.05 "$file" "./new-24k/cmn-$key.mp3";    # ex: cmn-很.mp3 (24k abr)
  lame --cbr -b 96 -m m -h --resample 22.05 "$file" "./new-96k/cmn-$key.mp3";    # ex: cmn-很.mp3 (96k cbr)
done

See also

Lingua Libre technical helps
Template {{Speakers category}} • {{Recommended lists}} • {{To iso 639-2}} • {{To iso 639-3}} • {{Userbox-records}} • {{Bot steps}}
Audio files How to create a frequency list? • Convert files formats • Denoise files with SoX • Rename and mass rename
Bots Help:Bots • LinguaLibre:Bot • Help:Log in to Lingua Libre with Pywikibot • Lingua Libre Bot (gh) • Olafbot • PamputtBot • Dragons Bot (gh)
MediaWiki MediaWiki: Help:Documentation opérationelle Mediawiki • Help:Database structure • Help:CSS • Help:Rename • Help:OAuth • LinguaLibre:User rights (rate limit) • Module:Lingua Libre record & {{Lingua Libre record}} • JS scripts: MediaWiki:Common.js • LastAudios.js • SoundLibrary.js • ItemsSugar.js • LexemeQueriesGenerator.js (pad) • Sparql2data.js (pad) • LanguagesGallery.js (pad) • Gadgets: Gadget-LinguaImporter.js • Gadget-Demo.js • Gadget-RecentNonAudio.js • LiLiZip.js
Queries Help:APIs • Help:SPARQL • SPARQL (intermediate) (stub) • SPARQL for lexemes (stub) • SPARQL for maintenance • Lingualibre:Wikidata (stub) • Help:SPARQL (HAL)
Reuses Help:Download datasets • Help:Embed audio in HTML
Unstable & tests Help:SPARQL/test
Categories Category:Technical reports
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