ps3mediaserver/ps3mediaserver — comment on commit 3c33d727cb93bf1758714e2684ad86d514192436
File:  line 0
By ExSport:

https://code.google.com/p/ps3mediaserver/source/search?q=preferIPv4Stack&origq=preferIPv4Stack&btnG=Search+Trunk
Also wrapper.conf includes hardcoded IPv4.