Configuration
There Isn't Any
EggEncoder is fully native and has no options to set. AddEggEncoder() takes no parameters:
builder.Services.AddEggEncoder();
This registers IMediaEncoder → NativeEncoder (scoped). There's no engine to pick, no binary path to provide, and nothing that can fail to resolve at startup due to missing external tooling.
Native Binary Resolution
The bundled libmp3lame.dll and libFLAC.dll are located automatically at runtime by NativeLibraryLoader, relative to AppContext.BaseDirectory — this is not configurable and requires no setup. See Native Binary Packaging for how the files get there.