No default support for codec 'klv'

[davy-code]

On PyAV version 16.0.0, I'm trying to get a klv data stream added to my output container like so:

 with av.open("udp://127.0.0.1?pkt_size=1316", mode='w', format='mpegts') as output_container:
       klv_stream = output_container.add_data_stream('klv')

Which gives me an error:
ValueError: Unknown data codec: klv

This is however taken from the documentations example where the example string 'klv' is given. I'm wondering which extra libraries I would have to install to get klv supported as a codec.