Found it! The discussion was regarding Chromecast specifically,so I don't know about other cast setups.
Also is from Nov 2021, so possibly out of date at this point?
I've linked to the concluding comment here, I found the whole chain worth reading however:
https://github.com/TeamNewPipe/NewPipe/issues/668#issuecomme...
Is the biggest challenge really in providing an AppID? I must be missing something because that doesn't seem like a big privacy concern or technical hurdle, which brings us back to no traceable logical problem other than "it's hard to do and I don't get paid for this" (which would be a fair position for an OSS maintainer to take).
Maybe the should look at how VLC streams to Chromecasts, because at least in the case of VLC, it's FOSS and sort of works.
The PFY is a reference to a character (the "Pimply Faced Youth") from The Bastard Operator from Hell [0]! I'm just starting out my career, so it felt appropriate.
My understanding is that they mostly didn't want to do anything more involved with Google than scrape a webpage and write an Android app - though I'm not on the team and haven't participated and couldn't say for sure.
I think they have looked at VLC - there's a lengthy workaround lower in the thread via VLC, but I've not read that part in depth.
Actually, just double checked. Looks like theres a mention here: https://github.com/TeamNewPipe/NewPipe/issues/668#issuecomme... of that being a possibility, but no ones commented on it or made any progress yet afaict.
[0] Originals here: http://bofharchive.com/BOFH.html, and I think The Register has new ones.
Maybe now that Vanced is toast, someone will step up and lay the pipe into newPipe to get it working properly? Is this just wishful thinking? We need a hero..
Do you happen to have a link to a GitHub issue or some other background? I'd like to learn more about this, I was under the impression cast-type devices (including Chromecast) usually implement DLNA which should be interface-able without any proprietary APIs. This is just from vague readings and recollections though.