Not familiar with Rockchip. Plenty of searches come up with cases of people incorporating ffmpeg into Rockchip projects. I still see the license files and headers. What is different with this DMCA takedown?

https://github.com/nyanmisaka/ffmpeg-rockchip

The one you reference doesn't look like it misrepresents the licenses, i.e. of you use it to make your own derivative you would expect to have to share modifications you make to the LGPL code.

That's because you can incorporate LGPL code into any project as long as you respect the license.

Rockchip is a hardware platform, what hardware the code runs on isn't relevant here.

Since the link to the actual code is DMCA’d in Rockchip’s repository, anyone have a fork so we can form an opinion independently?

So the comments explaining the situation from the HN community aren’t good enough?

If the repository were still accessible, the only thing I’d be looking for is whether the LGPL portions were modified or statically linked. Absent that, the license-based explanation makes sense.

I guess not?