It has nothing to do with wannacry, antivirus is signature based, it is normal that they do not detect a new malware like wannacry.
Are you the developer "Case" ? why is it doing something with sc.exe as it is only meant to copy files to the correct places ??
But personally I do not think this is false positive. 12 AV positive on virustotal is bad. I just checked lame.exe version 3.99 release 5 downloaded from elsewhere (hard to find which is the official site) and it has no alerts. Hoperfully I use only flac and ogg :-)
Pack updated with Opus 1.2.