Okay, seems like I made working package with bundled libmpv. Dll file is from this repo, I used latest release. I didn't find anything similar pre-built for Linux, and building this myself seems to be very time-consuming, and considering that installing and adding libmpv to linux packages is much easier than doing the same on windows, I think it's fine to have Bundled package windows-only, it only really preferred there IMO. The library here seems to be complete, with GPL parts, so I set license for Bundled package to be GPL too (I'm not sure that copyleft really works here, but I think it's better to assume it does).

For testing I modified OpenGL example's csproj to have this:

  <PropertyGroup> 
<RestoreSources>$(RestoreSources);../../Nickvision.MPVSharp/bin/Debug;../../Nickvision.MPVSharp.Bundled/bin/Debug;https://api.nuget.org/v3/index.json</RestoreSources>
  </PropertyGroup>
  
  <ItemGroup>
    <PackageReference Include="OpenTK" Version="4.7.7" />
    <PackageReference Include="Nickvision.MPVSharp.Bundled" Version="2023.7.2" />
  </ItemGroup>

And it worked.

I first tried to have ProjectReference instead of PackageReference in Bundled, but it was causing NU1102 error when build the example for some reason.