Acoustic fingerprinting is a technique for identifying songs from the way they “sound” rather from their existing metadata. That means that beets’ autotagger can theoretically use fingerprinting to tag files that don’t have any ID3 information at all (or have completely incorrect data). This plugin uses an open-source fingerprinting technology called Chromaprint and its associated Web service, called Acoustid.
Turning on fingerprinting can increase the accuracy of the autotagger—especially on files with very poor metadata—but it comes at a cost. First, it can be trickier to set up than beets itself (you need to set up the native fingerprinting library, whereas all of the beets core is written in pure Python). Also, fingerprinting takes significantly more CPU and memory than ordinary tagging—which means that imports will go substantially slower.
If you’re willing to pay the performance cost for fingerprinting, read on!
First, install pyacoustid itself. You can do this using pip, like so:
$ pip install pyacoustid
Then, you will need to install Chromaprint, either as a dynamic library or
in the form of a command-line tool (
Installing the Binary Command-Line Tool#
The simplest way to get up and running, especially on Windows, is to
download the appropriate Chromaprint binary package and place the
fpcalc.exe) on your shell search path. On Windows, this
means something like
C:\\Program Files. On OS X or Linux, put the
executable somewhere like
Installing the Library#
On OS X and Linux, you can also use a library installed by your package
manager, which has some advantages (automatic upgrades, etc.). The Chromaprint
site has links to packages for major Linux distributions. If you use
Homebrew on Mac OS X, you can install the library with
You will also need a mechanism for decoding audio files supported by the audioread library:
OS X has a number of decoders already built into Core Audio, so there’s no need to install anything.
On Linux, you can install GStreamer with PyGObject, FFmpeg, or MAD with pymad. How you install these will depend on your distribution. For example, on Ubuntu, run
apt-get install gstreamer1.0 python-gi. On Arch Linux, you want
pacman -S gstreamer python2-gobject. If you use GStreamer, be sure to install its codec plugins also (
Note that if you install beets in a virtualenv, you’ll need it to have
--system-site-packagesenabled for Python to see the GStreamer bindings.
On Windows, builds are provided by GStreamer
To decode audio formats (MP3, FLAC, etc.) with GStreamer, you’ll need the
standard set of Gstreamer plugins. For example, on Ubuntu, install the packages
Once you have all the dependencies sorted out, enable the
chroma plugin in
your configuration (see Using Plugins) to benefit from fingerprinting
the next time you run
beet import. (The plugin doesn’t produce any obvious
output by default. If you want to confirm that it’s enabled, you can try
running in verbose mode once with
beet -v import.)
You can also use the
beet fingerprint command to generate fingerprints for
items already in your library. (Provide a query to fingerprint a subset of your
library.) The generated fingerprints will be stored in the library database.
If you have the
import.write config option enabled, they will also be
written to files’ metadata.
There is one configuration option in the
controls whether to fingerprint files during the import process. To disable
fingerprint-based autotagging, set it to
no, like so:
chroma: auto: no
You can help expand the Acoustid database by submitting fingerprints for the
music in your collection. To do this, first get an API key from the Acoustid
service. Just use an OpenID or MusicBrainz account to log in and you’ll get a
short token string. Then, add the key to your
config.yaml as the
apikey in a section called
acoustid like so:
acoustid: apikey: AbCd1234
beet submit. (You can also provide a query to submit a subset of
your library.) The command will use stored fingerprints if they’re available;
otherwise it will fingerprint each file before submitting it.