a common affordance in scifi is that spaceships can just video call each other, even spaceships of different races who have never met before. this implies that there is a sufficiently mathematically obvious RTC protocol that all spacefaring races eventually discover
„but halcy, the computer simply adapts the signal“ try piping an opus bitstream into chatgpt, see how that goes

@halcy not sure about the protocol itself, but the codec shouldn't be a problem - the expanding radio shell will eventually transmit ffmpeg everywhere

https://www.planetary.org/articles/3390

This is how far human radio broadcasts have reached into the galaxy

There is an ever-expanding bubble announcing Humanity's presence to anyone listening in the Milky Way.

The Planetary Society