Amarok/Manuel/Divers/Gain en relecture

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Gain en relecture

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 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).

Ceci peut conduire à des situations inattendues : chansons d'un même artiste jouées à des niveaux différents de volume, etc ...

Est-ce que le gain en replay est utilisé ?

Pour savoir si le problème du volume est causé par le gain en replay ou par un mauvais encodage :

Désactiver le traitement du gain en replay (voir ci-dessus)

Start Amarok in debug mode and search for gain- related output:

amarok -d --nofork | grep gain

If replay gain is active for the played song, the output will be

Using gain of -10.28 with relative peak of -1

Afficher les informations de gain en replay

For .flac files, "metaflac" can be used to view embedded replay gain data:

metaflac --list Millencolin\ -\ Balanced\ Boy.flac

Among other things, this will show something like this:

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

Pour visualiser ces informations de piste dans la base de données de Amarok :

select id, title, albumgain, albumpeakgain, trackgain, trackpeakgain from tracks where title like "Balanced%";

Affichera:

+-------+------------------+-----------+---------------+-----------+---------------+
| id    | title            | albumgain | albumpeakgain | trackgain | trackpeakgain |
+-------+------------------+-----------+---------------+-----------+---------------+
| 10459 | Balanced Boy     |      0.53 |      -5.60297 |      0.44 |      -5.60297 |

Notez la différence des niveaux de loudness

Supprimer les informations de gain en replay

Supprimer d'abord, les métadata du fichier :

metaflac --remove-replay-gain Millencolin\ -\ Balanced\ Boy.flac

Après ça, rafraîchissez votre collection Amarok . Si le gain de replay est encore utilisé, modifiez l'entrée dans la base de données :

update tracks set albumgain=-1,albumpeakgain=-1,trackgain=-1,trackpeakgain=-1 where id=10459

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.