Cargo Features

[dependencies]
spotify-dl = { version = "0.5.4", default-features = false, features = ["mp3"] }
default = mp3

The mp3 feature is set by default whenever spotify-dl is added without default-features = false somewhere in the dependency tree.

mp3 default

Enables mp3lame-encoder ^0.1.5

spotify-dl has 2 features without comments.