Membrane.ParentSpec.via_in

You're seeing just the function via_in, go back to Membrane.ParentSpec module for more information.

via_in(builder, pad, opts \\ [])

via_in(
  link_builder_t(),
  Membrane.Pad.name_t() | Membrane.Pad.ref_t(),
  pad_props_t()
) :: link_builder_t() | no_return()

Specifies input pad name and properties of the subsequent child.

See the links section of the moduledoc for more information.