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Amarok/Manual/Various/ReplayGain

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=== Replay Gain ===‎

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[https://en.wikipedia.org/wiki/ReplayGain Replay gain] will automatically adjust the volume of the currently played song, relative to other songs, as determined by the person who encoded the audio file. To enable replay gain, see [[Special:myLanguage/Amarok/Manual/References/MenuAndCommandReference/Settings#Settings_Menu|Settings menu]].‎

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To handle this, '''Amarok''' relies on metadata embedded in the audio file:‎

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# If no replay gain information is embedded, '''Amarok''' will not adjust the volume # If replay gain information is found, it will be written into '''Amarok's''' database‎

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During playback, '''Amarok''' will only look into its own database for this information. Updates to the metadata of the file will not always get written into the database during a collection update (e.g. replay gain is deleted from file).‎

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This can lead to unexpected behavior: Songs from the same artist play at different volume levels etc.‎

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==== Is replay gain being used? ====‎

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To figure out if the volume problem is caused by replay gain or bad encoding:‎

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* Disable replay gain processing (see above)‎

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* Start '''Amarok''' in debug mode and search for gain- related output: {{Input|<nowiki>amarok -d --nofork | grep gain</nowiki>}} If replay gain is active for the played song, the output will be {{Output|<nowiki>Using gain of -10.28 with relative peak of -1</nowiki>}}‎

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==== View replay gain information ====‎

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For .flac files, "metaflac" can be used to view embedded replay gain data: {{Input|<nowiki>metaflac --list Millencolin\ -\ Balanced\ Boy.flac</nowiki>}} Among other things, this will show something like this: {{Output|<nowiki>METADATA block #2 type: 4 (VORBIS_COMMENT) is last: false length: 390 vendor string: reference libFLAC 1.2.1 20070917 comments: 14 comment[9]: REPLAYGAIN_REFERENCE_LOUDNESS=89.0 dB comment[10]: REPLAYGAIN_TRACK_GAIN=-1.55 dB comment[11]: REPLAYGAIN_TRACK_PEAK=0.75894165 comment[12]: REPLAYGAIN_ALBUM_GAIN=-4.19 dB comment[13]: REPLAYGAIN_ALBUM_PEAK=0.98712158 </nowiki>}}‎

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To view this tracks information within the '''Amarok''' database: {{Input|<nowiki>select id, title, albumgain, albumpeakgain, trackgain, trackpeakgain from tracks where title like "Balanced%";</nowiki>}}‎

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Will show: {{Output|<nowiki> +-------+------------------+-----------+---------------+-----------+---------------+ | id | title | albumgain | albumpeakgain | trackgain | trackpeakgain | +-------+------------------+-----------+---------------+-----------+---------------+ | 10459 | Balanced Boy | 0.53 | -5.60297 | 0.44 | -5.60297 | </nowiki>}}‎

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Note the difference in loudness levels‎

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==== Delete replay gain information ====‎

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First, delete the metadata from the file: {{Input|<nowiki>metaflac --remove-replay-gain Millencolin\ -\ Balanced\ Boy.flac</nowiki>}}‎

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After that, update your '''Amarok''' collection. If it is still using replay gain, update the database entry: {{Input|<nowiki>update tracks set albumgain=-1,albumpeakgain=-1,trackgain=-1,trackpeakgain=-1 where id=10459</nowiki>}}‎

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Restart '''Amarok''' and the log output should now show the updated values being used.‎

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Feel free to try and mess with the values manually to improve volume levels.‎

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[[Category:Amarok2.8]] [[Category:Multimedia]] [[Category:Tutorials]]‎

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