How to: optional dependencies
enable bonus features  by installing these python-packages from pypi or so:

enable [hashed passwords](#password-hashing) in config: `argon2-cffi`

enable [ftp-server](#ftp-server):
* for just plaintext FTP, `pyftpdlib` (is built into the SFX)
* with TLS encryption, `pyftpdlib pyopenssl`

enable [sftp-server](#sftp-server): `paramiko`

enable [music tags](#metadata-from-audio-files):
* either `mutagen` (fast, pure-python, skips a few tags, makes copyparty GPL? idk)
* or `ffprobe` (20x slower, more accurate, possibly dangerous depending on your distro and users)

enable [thumbnails](#thumbnails) of...
* **images:** `Pillow` and/or `pyvips` and/or `ffmpeg` (requires py2.7 or py3.5+)
* **videos/audio:** `ffmpeg` and `ffprobe` somewhere in `$PATH`
* **HEIF pictures:** `pyvips` or `ffmpeg` or `pillow-heif`
* **AVIF pictures:** `pyvips` or `ffmpeg` or `pillow-avif-plugin` or pillow v11.3+
* **JPEG XL pictures:** `pyvips` or `ffmpeg`
* **RAW images:** `rawpy`, plus one of `pyvips` or `Pillow` (for some formats)

enable sending [zeromq messages](#zeromq) from event-hooks: `pyzmq`

enable [smb](#smb-server) support (**not** recommended): `impacket==0.13.0`

`pyvips` gives higher quality thumbnails than `Pillow` and is 320% faster, using 270% more ram
* to install `pyvips` on Linux: `sudo apt install libvips42 && python3 -m pip install --user -U pyvips`
* to install `pyvips` on windows: `pip install --user -U "pyvips[binary]"`

to install FFmpeg on Windows, grab [a recent build](https://www.gyan.dev/ffmpeg/builds/ffmpeg-git-full.7z) -- you need `ffmpeg.exe` and `ffprobe.exe` from inside the `bin` folder; copy them into `C:\Windows\System32` or any other folder that's in your `%PATH%`