Revised ReplayGain specification - Revision history

Skamp: Make it clear that the REPLAYGAIN_REFERENCE_LOUDNESS tag goes against the ReplayGain philosophy of having a single target, not a moveable one.

2026-01-23T19:07:28Z

Make it clear that the REPLAYGAIN_REFERENCE_LOUDNESS tag goes against the ReplayGain philosophy of having a single target, not a moveable one.

← Older revision		Revision as of 19:07, 23 January 2026
Line 87:		Line 87:
	* .wav (Windows PCM) – No metadata support (use .bwf instead)		* .wav (Windows PCM) – No metadata support (use .bwf instead)
	** ID3 RIFF chunk possible (used by {{code\|loudgain}})		** ID3 RIFF chunk possible (used by {{code\|loudgain}})
	* .wv (~~WavePak~~) – '''APEv2'''		* .wv (WavPack) – '''APEv2'''

	===ID3v2===		===ID3v2===
Line 172:		Line 172:
	\|-		\|-
	\|Reference loudness		\|Reference loudness
	\|REPLAYGAIN_REFERENCE_LOUDNESS		\|<s>REPLAYGAIN_REFERENCE_LOUDNESS</s>
	\|[-]a.bb LUFS		\|[-]a.bb LUFS
	\| Use alternative reference levels; change ref levels without re-scanning the file		\| Use alternative reference levels; change ref levels without re-scanning the file.
	~~(note: this~~ field is harmful~~. The~~ standard has only one reference ~~level~~. The effective playback level is changed in player and does not require any form of rescanning.)		--
			This field is harmful and deviates from the standard, which has only one reference target. The effective playback level is changed within the player and does not require any form of rescanning.
	\|}		\|}

Case: /* De-Facto extensions */

2026-01-23T13:21:32Z

De-Facto extensions

← Older revision		Revision as of 13:21, 23 January 2026
Line 175:		Line 175:
	\|[-]a.bb LUFS		\|[-]a.bb LUFS
	\| Use alternative reference levels; change ref levels without re-scanning the file		\| Use alternative reference levels; change ref levels without re-scanning the file
			(note: this field is harmful. The standard has only one reference level. The effective playback level is changed in player and does not require any form of rescanning.)
	\|}		\|}

Skamp: Proposed tag: REPLAYGAIN_ALGORITHM

2026-01-22T21:42:32Z

Proposed tag: REPLAYGAIN_ALGORITHM

@@ Line 1: / Line 1: @@
 <font size="4">''This is a proposed update to the [[ReplayGain 1.0 specification|original ReplayGain specification]]. This proposal is currently '''Under Construction'''. Please discuss this proposal on the [[Talk:ReplayGain 2.0 specification|discussion page]] or the [https://hydrogenaudio.org/index.php/topic,129032.0.html dedicated thread on Hydrogenaudio].'' --[[User:Skamp|Skamp]] 22:10 CET, January 22, 2026</font>
@@ Line 161: / Line 159: @@
 !Metadata
 !Key
-!alue format
+!Value format
-! Purpose
+!Purpose
 |-
 |Track range
@@ Line 177: / Line 175: @@
 |[-]a.bb LUFS
 | Use alternative reference levels; change ref levels without re-scanning the file
 |}

Skamp: changed the disclaimer to my name, and linked to the updated HA thread

2026-01-22T21:12:21Z

changed the disclaimer to my name, and linked to the updated HA thread

← Older revision		Revision as of 21:12, 22 January 2026
Line 1:		Line 1:
	DISPLAYTITLE		DISPLAYTITLE

	<font size="4">''This is a proposed update to the [[ReplayGain 1.0 specification\|original ReplayGain specification]]. This proposal is currently '''Under Construction'''. Please discuss this proposal on the [[Talk:ReplayGain 2.0 specification\|discussion page]] or the [~~http~~://~~www.~~hydrogenaudio.org~~/forums~~/index.php~~?showforum=1 General Audio forum~~].'' --[[User:~~Notat~~\|~~Notat~~]] 23:42, ~~8 October 2012 (CEST)~~</font>		<font size="4">''This is a proposed update to the [[ReplayGain 1.0 specification\|original ReplayGain specification]]. This proposal is currently '''Under Construction'''. Please discuss this proposal on the [[Talk:ReplayGain 2.0 specification\|discussion page]] or the [https://hydrogenaudio.org/index.php/topic,129032.0.html dedicated thread on Hydrogenaudio].'' --[[User:Skamp\|Skamp]] 22:10 CET, January 22, 2026</font>

	Although music is encoded to a digital format with a clearly defined maximum peak amplitude, and although most recordings are normalized to utilize this peak amplitude, not all recordings sound equally loud. This is because once this peak amplitude is reached, perceived loudness can be further increased through signal-processing techniques such as dynamic range compression and equalization.<ref>Source: Wikipedia - [http://en.wikipedia.org/wiki/Loudness_war Loudness war]</ref> Therefore, the loudness of a given album has more to do with the year of issue or the whim of the producer than the intended emotional effect. Because of this, a random play through a music collection can have one leaping for the volume control every other track.		Although music is encoded to a digital format with a clearly defined maximum peak amplitude, and although most recordings are normalized to utilize this peak amplitude, not all recordings sound equally loud. This is because once this peak amplitude is reached, perceived loudness can be further increased through signal-processing techniques such as dynamic range compression and equalization.<ref>Source: Wikipedia - [http://en.wikipedia.org/wiki/Loudness_war Loudness war]</ref> Therefore, the loudness of a given album has more to do with the year of issue or the whim of the producer than the intended emotional effect. Because of this, a random play through a music collection can have one leaping for the volume control every other track.

Skamp at 19:30, 22 January 2026

2026-01-22T19:30:35Z

← Older revision		Revision as of 19:30, 22 January 2026
Line 12:		Line 12:
	Loudness is a subjective measure of the intensity of sound. The correlation of perceived loudness to sound pressure level is determined by the peculiarities of the auditory system.		Loudness is a subjective measure of the intensity of sound. The correlation of perceived loudness to sound pressure level is determined by the peculiarities of the auditory system.

	The ~~original~~ [[ReplayGain 1.0 specification\|ReplayGain specification]] described a loudness measurement system which included a weighting filter, root mean square (RMS) measurement and statistical processing that model human perception of loudness in both the frequency and time domains.		The [[ReplayGain 1.0 specification\|original ReplayGain specification]] described a loudness measurement system which included a weighting filter, root mean square (RMS) measurement and statistical processing that model human perception of loudness in both the frequency and time domains.

	Since original ReplayGain proposal in 2001, the science, practice and standards for loudness normalization have been advanced significantly. The current industry standard approach to loudness measurement is described by the International Telecommunications Union<ref>http://www.itu.int/en/Pages/default.aspx</ref> (ITU) as BS.1770. The most recent version of this standard is known as ITU BS.1770-5<ref>https://www.itu.int/rec/R-REC-BS.1770-5-202311-I/en</ref> and was published in December 2023. The ITU work is freely available and is not believed to be encumbered by any patent issues. The ITU BS.1770-2 standard has been adopted in the United States by the [http://www.atsc.org ATSC] as [http://www.atsc.org/cms/standards/a_85-2011a.pdf A/85] and in Europe by the [http://www.ebu.ch European Broadcast Union] as [http://tech.ebu.ch/docs/tech/tech3343.pdf EBU R-128] for broadcast audio.		Since original ReplayGain proposal in 2001, the science, practice and standards for loudness normalization have been advanced significantly. The current industry standard approach to loudness measurement is described by the International Telecommunications Union<ref>http://www.itu.int/en/Pages/default.aspx</ref> (ITU) as BS.1770. The most recent version of this standard is known as ITU BS.1770-5<ref>https://www.itu.int/rec/R-REC-BS.1770-5-202311-I/en</ref> and was published in December 2023. The ITU work is freely available and is not believed to be encumbered by any patent issues. The ITU BS.1770-2 standard has been adopted in the United States by the [http://www.atsc.org ATSC] as [http://www.atsc.org/cms/standards/a_85-2011a.pdf A/85] and in Europe by the [http://www.ebu.ch European Broadcast Union] as [http://tech.ebu.ch/docs/tech/tech3343.pdf EBU R-128] for broadcast audio.

Skamp: Skamp moved page ReplayGain 2.0 specification to Revised ReplayGain specification: There is confusion about having two distinct, numbered specifications for ReplayGain

2026-01-22T19:28:27Z

Skamp moved page ReplayGain 2.0 specification to Revised ReplayGain specification: There is confusion about having two distinct, numbered specifications for ReplayGain

← Older revision	Revision as of 19:28, 22 January 2026
(No difference)

Skamp: Changed "ReplayGain 1.0 specification" to "the original ReplayGain specification"

2026-01-22T19:26:43Z

Changed "ReplayGain 1.0 specification" to "the original ReplayGain specification"

← Older revision		Revision as of 19:26, 22 January 2026
Line 12:		Line 12:
	Loudness is a subjective measure of the intensity of sound. The correlation of perceived loudness to sound pressure level is determined by the peculiarities of the auditory system.		Loudness is a subjective measure of the intensity of sound. The correlation of perceived loudness to sound pressure level is determined by the peculiarities of the auditory system.

	The original [~~http://wiki.hydrogenaudio.org/index.php?title=Replaygain~~ ReplayGain 1.0 specification] described a loudness measurement system which included a weighting filter, root mean square (RMS) measurement and statistical processing that model human perception of loudness in both the frequency and time domains.		The original [[ReplayGain 1.0 specification\|ReplayGain specification]] described a loudness measurement system which included a weighting filter, root mean square (RMS) measurement and statistical processing that model human perception of loudness in both the frequency and time domains.

	Since original ReplayGain proposal in 2001, the science, practice and standards for loudness normalization have been advanced significantly. The current industry standard approach to loudness measurement is described by the International Telecommunications Union<ref>http://www.itu.int/en/Pages/default.aspx</ref> (ITU) as BS.1770. The most recent version of this standard is known as ITU BS.1770-5<ref>https://www.itu.int/rec/R-REC-BS.1770-5-202311-I/en</ref> and was published in December 2023. The ITU work is freely available and is not believed to be encumbered by any patent issues. The ITU BS.1770-2 standard has been adopted in the United States by the [http://www.atsc.org ATSC] as [http://www.atsc.org/cms/standards/a_85-2011a.pdf A/85] and in Europe by the [http://www.ebu.ch European Broadcast Union] as [http://tech.ebu.ch/docs/tech/tech3343.pdf EBU R-128] for broadcast audio.		Since original ReplayGain proposal in 2001, the science, practice and standards for loudness normalization have been advanced significantly. The current industry standard approach to loudness measurement is described by the International Telecommunications Union<ref>http://www.itu.int/en/Pages/default.aspx</ref> (ITU) as BS.1770. The most recent version of this standard is known as ITU BS.1770-5<ref>https://www.itu.int/rec/R-REC-BS.1770-5-202311-I/en</ref> and was published in December 2023. The ITU work is freely available and is not believed to be encumbered by any patent issues. The ITU BS.1770-2 standard has been adopted in the United States by the [http://www.atsc.org ATSC] as [http://www.atsc.org/cms/standards/a_85-2011a.pdf A/85] and in Europe by the [http://www.ebu.ch European Broadcast Union] as [http://tech.ebu.ch/docs/tech/tech3343.pdf EBU R-128] for broadcast audio.

Skamp at 19:20, 22 January 2026

2026-01-22T19:20:25Z

← Older revision		Revision as of 19:20, 22 January 2026
Line 1:		Line 1:
	DISPLAYTITLE		DISPLAYTITLE

	<font size="4">''This is a proposed update to the [[ReplayGain 1.0 specification]]. This proposal is currently '''Under Construction'''. Please discuss this proposal on the [[Talk:ReplayGain 2.0 specification\|discussion page]] or the [http://www.hydrogenaudio.org/forums/index.php?showforum=1 General Audio forum].'' --[[User:Notat\|Notat]] 23:42, 8 October 2012 (CEST)</font>		<font size="4">''This is a proposed update to the [[ReplayGain 1.0 specification\|original ReplayGain specification]]. This proposal is currently '''Under Construction'''. Please discuss this proposal on the [[Talk:ReplayGain 2.0 specification\|discussion page]] or the [http://www.hydrogenaudio.org/forums/index.php?showforum=1 General Audio forum].'' --[[User:Notat\|Notat]] 23:42, 8 October 2012 (CEST)</font>

	Although music is encoded to a digital format with a clearly defined maximum peak amplitude, and although most recordings are normalized to utilize this peak amplitude, not all recordings sound equally loud. This is because once this peak amplitude is reached, perceived loudness can be further increased through signal-processing techniques such as dynamic range compression and equalization.<ref>Source: Wikipedia - [http://en.wikipedia.org/wiki/Loudness_war Loudness war]</ref> Therefore, the loudness of a given album has more to do with the year of issue or the whim of the producer than the intended emotional effect. Because of this, a random play through a music collection can have one leaping for the volume control every other track.		Although music is encoded to a digital format with a clearly defined maximum peak amplitude, and although most recordings are normalized to utilize this peak amplitude, not all recordings sound equally loud. This is because once this peak amplitude is reached, perceived loudness can be further increased through signal-processing techniques such as dynamic range compression and equalization.<ref>Source: Wikipedia - [http://en.wikipedia.org/wiki/Loudness_war Loudness war]</ref> Therefore, the loudness of a given album has more to do with the year of issue or the whim of the producer than the intended emotional effect. Because of this, a random play through a music collection can have one leaping for the volume control every other track.

Skamp: Clarified the confusion between ReplayGain having two different versions

2026-01-22T19:18:11Z

Clarified the confusion between ReplayGain having two different versions

Show changes

Artoria2e5: /* Reduced gain */

2023-08-07T10:52:30Z

Reduced gain

← Older revision		Revision as of 10:52, 7 August 2023
Line 218:		Line 218:

	:<math>min( 10^\frac{RG + G_{pre-amp}}{20}, \frac{1}{peak amplitude} )</math>		:<math>min( 10^\frac{RG + G_{pre-amp}}{20}, \frac{1}{peak amplitude} )</math>
			<!-- use this when tex is fixed: :<math>\operatorname{min}( 10^\frac{RG + G_{pre-amp}}{20}, \frac{1}{L_{\mathrm{peak}}} )</math> -->

	===Hardware implementation===		===Hardware implementation===