Currently, there are two large problems in IT:
- hospital networks security
- workable videoconferencing for more than 8 people

Remember the time when we thought cache invalidation is hard? Quaint.

>workable videoconferencing for more than 8 people

oh, you mean multicast?

@kragen no no, @wolf480pl is right. The only sane, working solution for large-scale videoconferencing would probably need to be based on multicast.

@rysiek @wolf480pl if by "multicast" you mean "IP multicast" I think the preponderance of the evidence is that it's not workable at internet scale. if by "multicast" you mean more generally a system, including, e.g., P2P overlay networks, where you send data and multiple people receive it then it's tautologically correct: that's what videoconferencing does. also, say, IRC

@kragen @rysiek

>if by "multicast" you mean "IP multicast"

No. I mean the abstract problem of multicast.

And yes, it's obvious that videoconferencing requires multicast on some level.

What I claim is that multicast is the only hard problem here. That when we solve multicast, the rest is easy.


@wolf480pl @rysiek Oh, that sounds reasonable. I don't know if it's true because I haven't tried writing videoconferencing software myself. I feel like there might be other important problems, like security, user interface, and graceful degradation, which may or may not be separable from "multicast" itself.

@kragen @rysiek
yeah but if you have one that works for 4 users and doesn't work for 8 users, it probably means your implementation of multicast is the problem.

@wolf480pl @rysiek It might also be that your echo cancelation doesn't consider a long enough time span, or that your CPU can't keep up with decoding 6 or more MPEG-4 streams, or that the UI makes it impossible to figure out who forgot to mute their microphone next to the jackhammer, or that griefers impersonating one another or sending that photo of the guy with the penis down to his knee aren't a problem in practice with only 4 people, etc.

People gotta stop posting pictures of my penis on video conferences Tbh
@wolf480pl @rysiek

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