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=== Replay Gain ===

[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]].

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

# 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

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).

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

==== Is replay gain being used? ====

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

* Disable replay gain processing (see above)

* 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>}}

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

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>}}

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>}}

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

Note the difference in loudness levels

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

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

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>}}

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

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]]