mcempgvout.dll is a mcempgvout
belonging to MainConcept (MCE)® MPEG Video Wrapper
from MainConcept AG
Non-system processes like mcempgvout.dll originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.