Replay Gain: Difference between revisions

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=Introduction=
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Replaygain is the name of a technology created to achieve the same playback volume of audio files. It specifies the reference level of 89dB and an algorithm to measure the perceived loudness of audio data.
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=Implementations=
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There are different replaygain implementations, each with its own uses and strength. Most of them use [[meta data]] to indicate the level of the volume change (Volume is adjusted on playback; needs player/decoder support) others modify the Audio Data itself. Generally it is recommended to use an implementation which uses meta data and does not touch the audio itself.
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Replaygain has significant advantages over [[Normalization|normalizing]]. It allows the peak loudness of a song to be consistant over an entire collection of audio, much like normalizing (this is called 'Track Gain'). However, it also allows the peak loudness of an album to be consistant over a entire music collection, allowing the dynamics of album to remain (This is called 'Album Gain'). In a meta data based solution, information on both types of replaygain can be stored, and the desired playback effect can be switched back and forth in the appropriate player. However, if the audio is permanently modified, only one type of raplaygain can be chosen.
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==MP3Gain==
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[http://mp3gain.sourceforge.net/ MP3Gain]
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Format: [[MP3]]
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Method: Audio or Meta
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Limitations: Limited to 1.5dB steps in Audio Data mode
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[http://homeinterest1mo.fiberia.com | Home Interest Mortgage Rate Refinance] auto insurance online
==LAME==
[http://refinancehomemtg.fiberia.com | Refinance Home Mortgage Interest Rate] auto insurance quote
 
[http://fixedratemortg12.fiberia.com | Fixed Rate Mortgage] universal life insurance
[http://lame.sourceforge.net/ LAME]
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Format: [[MP3]]
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Method: Header ([http://gabriel.mp3-tech.org/mp3infotag.html mp3infotag])
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Notes: Added during encoding; not supported by any player yet; Track Gain only
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==Replaygain==
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[http://rarewares.org/mpc.html MPC replaygain]
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[http://fixedmortgagerat.fiberia.com | Fixed Mortgage Rate] california health insurance
Format: MPC
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Method: Header (similar to Meta data method. See "notes".)
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Notes: Replaygain values are stored in the header and replaygain is part of the Musepack specifications; therefore any Musepack decoder that does not support replaygain can be considered broken.
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==Vorbisgain==
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[http://www.sjeng.org/vorbisgain.html Vorbisgain]
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Format: [[Ogg Vorbis]]
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Method: Meta (in [[Vorbis comment]])
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[http://insurancemortga.fiberia.com | Insurance Mortgage] health insurance quote in california
 
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==FLAC/metaflac==
[http://mortgageloan.fiberia.com | Mortgage Loan] auto insurance in california
 
[http://citymortgagenas.fiberia.com | City Mortgage National] california auto insurance
[http://flac.sf.net FLAC]
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Format: [[FLAC]]
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Method: Meta (in [[Vorbis comment]])
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==foobar2000 replaygain scanner==
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[http://foobar2000.org Foobar2000]
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Format:
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* [[MP3]]: Values written to [[APEv2]] or [[ID3v2]] tags.
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* [[MPC]]: Values written to header as decribed under "replaygain".
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* [[Ogg Vorbis]]: In [[Vorbis comment]].
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* [[WavPack]]: Values written to [[APEv2]] tags.
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* [[AAC]]: Values written to [[APEv2]] tags.
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* [[MP4]]: Uses its own itunes-compatible tagging system (though itunes does not support replaygain).
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* [[FLAC]]: In [[Vorbis comment]].
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* [[APE]]: Values written to [[APEv2]] tags.
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* [[WAV]]: Optionally saved into [[APEv2]] tags; otherwise the foobar2000 database is used.
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* Modules ([[MOD]] etc.): Optionally saved into [[APEv2]] tags; otherwise the foobar2000 database is used.
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You can also choose to only have the replaygain values saved in the foobar2000 database and leave the files untouched.
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All other formats are supported but the replaygain values are saved to the foobar2000 database.
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==Wavegain==
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[http://www.rarewares.org/files/others/wavegain.zip Wavegain]
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Format: PCM Wave
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Method: Audio
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Limitations: Irreversible
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=Players support=
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Replaygain being present in the specs of flac, mpc and ape formats, any player that support those formats usually support replaygain.
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The situation with MP3 is rather different, as it was not part of the mp3 specs. The APEv2 tags metadata implementation is somewhat becoming the de-facto standard.
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==Windows==
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* [[Foobar2000]] supports replaygain in all possible aspects.
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* [[Winamp]]. MP3 replaygain support with adequate plugins (e.g. [http://www.aikis.or.jp/~otachan/in_mpg123.html Otachan's in_mpg123] - if you can't read japanese, you can find details [http://www.hydrogenaudio.org/forums/index.php?showtopic=18530 in this thread])
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* [[XMPlay]] recently implemented replaygain
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and probably others.
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==Linux==
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* [[XMMS]]. Reads replaygain from [[FLAC]], [[MPC]], [[Ogg Vorbis]] ..
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For [[MP3]], use the CVS version of the [http://xmms-mad.sourceforge.net/ xmms-mad] mp3 plugin (it's not yet released as binary, furthermore not available in distribs' versions for now. Meanwhile binaries are available here: [http://perso.crans.org/~krempp/xmms-mad/ custom binaries])
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* [[amaroK]]. By using the amaroK-script [http://kde-apps.org/content/show.php?content=26073 ReplayGain]
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and possibly others, since [http://developer.kde.org/~wheeler/taglib.html TagLib] added support for [[APEv2]] tags in [[MP3]] files, players using this library (like [[amaroK]] and [[JuK]]) might support that kind of replaygain tags in the near future.
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* [http://www.sacredchao.net/quodlibet Quod Libet] reads replaygain from [[Ogg Vorbis]], [[FLAC]], and [[MPC]]
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Requires support to be enabled (via the appropriate python bindings and libraries) for the above formats. Does not support replaygain values stored in [[APEv2]] tags in [[MP3]]s.
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==Portable devices==
 
Current development builds of [http://www.rockbox.org/ Rockbox] for the iRiver H100 series players support replaygain for some encoder formats. This is a rapidly evolving feature. There are no other portable players known to support replaygain.
 
The iPod features ''Soundcheck'', which seems to produce roughly the same normalization gains as replaygain, but doesnt provide an Album Gain.
 
 
=Additional reading=
* [http://replaygain.hydrogenaudio.org Original replaygain website]

Revision as of 18:56, 27 January 2006

Introduction

Replaygain is the name of a technology created to achieve the same playback volume of audio files. It specifies the reference level of 89dB and an algorithm to measure the perceived loudness of audio data.


Implementations

There are different replaygain implementations, each with its own uses and strength. Most of them use meta data to indicate the level of the volume change (Volume is adjusted on playback; needs player/decoder support) others modify the Audio Data itself. Generally it is recommended to use an implementation which uses meta data and does not touch the audio itself.

Replaygain has significant advantages over normalizing. It allows the peak loudness of a song to be consistant over an entire collection of audio, much like normalizing (this is called 'Track Gain'). However, it also allows the peak loudness of an album to be consistant over a entire music collection, allowing the dynamics of album to remain (This is called 'Album Gain'). In a meta data based solution, information on both types of replaygain can be stored, and the desired playback effect can be switched back and forth in the appropriate player. However, if the audio is permanently modified, only one type of raplaygain can be chosen.


MP3Gain

MP3Gain

Format: MP3

Method: Audio or Meta

Limitations: Limited to 1.5dB steps in Audio Data mode

LAME

LAME

Format: MP3

Method: Header (mp3infotag)

Notes: Added during encoding; not supported by any player yet; Track Gain only


Replaygain

MPC replaygain

Format: MPC

Method: Header (similar to Meta data method. See "notes".)

Notes: Replaygain values are stored in the header and replaygain is part of the Musepack specifications; therefore any Musepack decoder that does not support replaygain can be considered broken.


Vorbisgain

Vorbisgain

Format: Ogg Vorbis

Method: Meta (in Vorbis comment)


FLAC/metaflac

FLAC

Format: FLAC

Method: Meta (in Vorbis comment)


foobar2000 replaygain scanner

Foobar2000


Format:

  • MP3: Values written to APEv2 or ID3v2 tags.
  • MPC: Values written to header as decribed under "replaygain".
  • Ogg Vorbis: In Vorbis comment.
  • WavPack: Values written to APEv2 tags.
  • AAC: Values written to APEv2 tags.
  • MP4: Uses its own itunes-compatible tagging system (though itunes does not support replaygain).
  • FLAC: In Vorbis comment.
  • APE: Values written to APEv2 tags.
  • WAV: Optionally saved into APEv2 tags; otherwise the foobar2000 database is used.
  • Modules (MOD etc.): Optionally saved into APEv2 tags; otherwise the foobar2000 database is used.

You can also choose to only have the replaygain values saved in the foobar2000 database and leave the files untouched.

All other formats are supported but the replaygain values are saved to the foobar2000 database.


Wavegain

Wavegain

Format: PCM Wave

Method: Audio

Limitations: Irreversible

Players support

Replaygain being present in the specs of flac, mpc and ape formats, any player that support those formats usually support replaygain.

The situation with MP3 is rather different, as it was not part of the mp3 specs. The APEv2 tags metadata implementation is somewhat becoming the de-facto standard.


Windows

and probably others.

Linux

For MP3, use the CVS version of the xmms-mad mp3 plugin (it's not yet released as binary, furthermore not available in distribs' versions for now. Meanwhile binaries are available here: custom binaries)

and possibly others, since TagLib added support for APEv2 tags in MP3 files, players using this library (like amaroK and JuK) might support that kind of replaygain tags in the near future.

Requires support to be enabled (via the appropriate python bindings and libraries) for the above formats. Does not support replaygain values stored in APEv2 tags in MP3s.

Portable devices

Current development builds of Rockbox for the iRiver H100 series players support replaygain for some encoder formats. This is a rapidly evolving feature. There are no other portable players known to support replaygain.

The iPod features Soundcheck, which seems to produce roughly the same normalization gains as replaygain, but doesnt provide an Album Gain.


Additional reading