The repo in question incorporated FFmpeg code while claiming their code is Apache 2.0-licensed over 1.5 years ago[1] This is not allowed under the LGPL, which mandates dynamic linking against the library. They copy-pasted FFmpeg code into their repo instead. [1] https://x.com/HermanChen1982/status/1761230920563233137
What happens when you want to mix two libraries with different licences?
Copyleft licenses are designed to prevent you mixing code as the licenses are generally incompatible with mixing.
More permissive license will generally allow you to mix licenses. This is why you can ship permissive code in a proprietary code base.
As for linking, “weak copyleft” license allow you to link but not to “mix” code. This is essentially the point of the LGPL.