  [](https://pypi.org/project/mfbatch/) 
[](https://github.com/iluvcapra/mfbatch/actions/workflows/pylint.yml)
# mfbatch
`mfbatch` is a command-line tool for batch-editing FLAC audio file metadata.
It reads a directory of FLAC files, extracts the existing metadata to an
intelligent text file format that the user can modify to update a large number
of files and dynamic per-file metadata with a minimal number of edits.
`mfbatch` is a front-end for `metaflac(1)` which must be installed on the
system.
## Motivation
I've been reorganzing my sound effects library recently and have had to edit a
large number of FLAC files, adding and editing descriptions, normalizing
fields etc. and this is one of the tools I've come up with for updating a large
number of FLAC files in an easy way quickly. It works completely in the command
line and is designed to be used with your favorite text editor.
## Workflow
### 1) Create a new `MFBATCH_LIST` file for a directory of FLAC files.
```sh
$ cd path/to/my/flacs
$ mfbatch -c
```
`mfbatch` will scan the current working directory and
all subdirectories recursively. You can use a `-p` option
to switch to another directory before scanning.
### 2) Edit the `MFBATCH_LIST` file in your `$EDITOR`.
```sh
$ mfbatch --edit
```
The `MFBATCH_LIST` file will contain a transcript of all of the flac files
in the selected folder along with their current metadata.
```sh
:set ALBUM 'Test Album 1'
:set ARTIST 'Test Artist'
:set DESCRIPTION 'Tone file #1, test tone 440Hz'
:setp TITLE DESCRIPTION "^Tone file #(\d+).*" 'Tone \1'
./tone1.flac
:set DESCRIPTION 'Tone file #2, also 440Hz'
./tone2.flac
:unset DESCRIPTION
:set DESCRIPTION 'Tone file #3'
./tone3.flac
```
The `MFBATCH_LIST` format allows you to set metadata once and then write values
to a run of files all at once. Several commands are available to manipulate
the metadata written to the files.
### 3) After you've made the changes you want to make, write them to the files.
```sh
$ mfbatch -W
```
Writing metadata is interactive, `mfbatch` will display the
metdata to be written to each file and metadata can be
edited interactively at a prompt before writing.
## Limitations
* Does not support newlines in field values. This is mostly by choice, newlines
don't offer any benefit in my preferred sound library programs but this
wouldn't be a tough feature to add if anyone needed it.
* Does not support multiple artwork types, everything is stored as type `3`/
(album artwork-front).
* Can only store unique field keys, field values of the same key overwrite old
values. This is also something that is tailored to my use-case and could be
changed if there was interest in doing so.
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