Membrane.Element.WithInputPads.def_input_pads

You're seeing just the macro def_input_pads, go back to Membrane.Element.WithInputPads module for more information.
Link to this macro

def_input_pads(pads)

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This macro is deprecated. Use def_input_pad/2 for each pad instead.

Macro that defines multiple input pads for the element.

Deprecated in favor of def_input_pad/2