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Difference between revisions of "Converting audios"
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$ ffmpeg -i "$file" # print out metadata of $file, for some formats only | $ ffmpeg -i "$file" # print out metadata of $file, for some formats only | ||
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Input #0, ogg, from './data/cmn-0a0a8a8b.ogg': | Input #0, ogg, from './data/cmn-0a0a8a8b.ogg': | ||
Duration: 00:00:01.25, start: 0.000000, bitrate: 99 kb/s | Duration: 00:00:01.25, start: 0.000000, bitrate: 99 kb/s | ||
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SWAC_TECH_DATE : 2009-07-08 | SWAC_TECH_DATE : 2009-07-08 | ||
SWAC_TECH_SOFT : Shtooka Recorder/1.3 | SWAC_TECH_SOFT : Shtooka Recorder/1.3 | ||
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Revision as of 17:12, 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 :
avconvhave 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="./dir/cmn-0a0a8a8b.flac" # path to .flac file into varible "$file"
$ ffmpeg -i "$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