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125 lines
4.3 KiB
ReStructuredText
125 lines
4.3 KiB
ReStructuredText
ReplayGain Plugin
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=================
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This plugin adds support for `ReplayGain`_, a technique for normalizing audio
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playback levels.
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.. _ReplayGain: http://wiki.hydrogenaudio.org/index.php?title=ReplayGain
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Installation
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------------
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This plugin can use one of three backends to compute the ReplayGain values:
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GStreamer, mp3gain (and its cousin, aacgain), and Python Audio Tools. mp3gain
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can be easier to install but GStreamer and Audio Tools support more audio
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formats.
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Once installed, this plugin analyzes all files during the import process. This
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can be a slow process; to instead analyze after the fact, disable automatic
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analysis and use the ``beet replaygain`` command (see below).
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GStreamer
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`````````
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To use `GStreamer`_ for ReplayGain analysis, you will of course need to
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install GStreamer and plugins for compatibility with your audio files.
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You will need at least GStreamer 1.0 and `PyGObject 3.x`_ (a.k.a. python-gi).
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.. _PyGObject 3.x: https://wiki.gnome.org/action/show/Projects/PyGObject
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.. _GStreamer: http://gstreamer.freedesktop.org/
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Then, enable the ``replaygain`` plugin (see :ref:`using-plugins`) and specify
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the GStreamer backend by adding this to your configuration file::
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replaygain:
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backend: gstreamer
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mp3gain and aacgain
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```````````````````
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In order to use this backend, you will need to install the `mp3gain`_
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command-line tool or the `aacgain`_ fork thereof. Here are some hints:
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* On Mac OS X, you can use `Homebrew`_. Type ``brew install aacgain``.
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* On Linux, `mp3gain`_ is probably in your repositories. On Debian or Ubuntu,
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for example, you can run ``apt-get install mp3gain``.
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* On Windows, download and install the original `mp3gain`_.
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.. _mp3gain: http://mp3gain.sourceforge.net/download.php
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.. _aacgain: http://aacgain.altosdesign.com
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.. _Homebrew: http://mxcl.github.com/homebrew/
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Then, enable the plugin (see :ref:`using-plugins`) and specify the "command"
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backend in your configuration file::
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replaygain:
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backend: command
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If beets doesn't automatically find the ``mp3gain`` or ``aacgain`` executable,
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you can configure the path explicitly like so::
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replaygain:
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command: /Applications/MacMP3Gain.app/Contents/Resources/aacgain
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Python Audio Tools
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``````````````````
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This backend uses the `Python Audio Tools`_ package to compute ReplayGain for
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a range of different file formats. The package is not available via PyPI; it
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must be installed manually.
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On OS X, most of the dependencies can be installed with `Homebrew`_::
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brew install mpg123 mp3gain vorbisgain faad2 libvorbis
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.. _Python Audio Tools: http://audiotools.sourceforge.net
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Configuration
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-------------
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To configure the plugin, make a ``replaygain:`` section in your
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configuration file. The available options are:
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- **auto**: Enable ReplayGain analysis during import.
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Default: ``yes``.
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- **backend**: The analysis backend; either ``gstreamer``, ``command``, or ``audiotools``.
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Default: ``command``.
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- **overwrite**: Re-analyze files that already have ReplayGain tags.
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Default: ``no``.
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- **targetlevel**: A number of decibels for the target loudness level.
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Default: 89.
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These options only work with the "command" backend:
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- **apply**: If you use a player that does not support ReplayGain
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specifications, you can force the volume normalization by applying the gain
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to the file via the ``apply`` option. This is a lossless and reversible
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operation with no transcoding involved.
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Default: ``no``.
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- **command**: The path to the ``mp3gain`` or ``aacgain`` executable (if beets
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cannot find it by itself).
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For example: ``/Applications/MacMP3Gain.app/Contents/Resources/aacgain``.
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Default: Search in your ``$PATH``.
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- **noclip**: Reduce the amount of ReplayGain adjustment to whatever amount
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would keep clipping from occurring.
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Default: ``yes``.
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Manual Analysis
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---------------
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By default, the plugin will analyze all items an albums as they are implemented.
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However, you can also manually analyze files that are already in your library.
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Use the ``beet replaygain`` command::
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$ beet replaygain [-a] [QUERY]
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The ``-a`` flag analyzes whole albums instead of individual tracks. Provide a
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query (see :doc:`/reference/query`) to indicate which items or albums to
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analyze.
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ReplayGain analysis is not fast, so you may want to disable it during import.
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Use the ``auto`` config option to control this::
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replaygain:
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auto: no
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