Currently Being ModeratedJul 22, 2011 4:49 AM (in response to Doug Stringham)
I have a different but application-related problem: when I select my Documents folder, I get an "Application Quit Unexpectedly" report that shows the following -
Process: VTDecoderXPCService 
Path: /System/Library/PrivateFrameworks/VideoToolbox.framework/Versions/A/XPCServices /VTDecoderXPCService.xpc/Contents/MacOS/VTDecoderXPCService
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: ??? 
The Documents folder closes and I can not read it.
Currently Being ModeratedJul 25, 2011 2:30 PM (in response to Doug Stringham)
OK... I finally discovered the source of the problem.
VTDecoderXPCService is the sandboxing for video content in Lion. All things that are QuickTime related, audio or video, are sandboxed by this service. It just clicked as to what it is. We have iCam for our iPhones. It allows us to remotely view from the webcams on our machines. So... because iCamSource is a QuickTime-related service, VTDecoderXPCService takes over. So when iCam is operating, it's sucking up 25% of the CPU. Which I'm going to report to the developer. :-)
Currently Being ModeratedSep 7, 2011 2:38 PM (in response to Doug Stringham)
I too see this problem, whenever I navigate to a folder containing lots of pptx or ppt files. Quite annoying. It happened from day one of using my new MacBookProMacBookPro, Mac OS X (10.7.1), Time Machine 2TB, Imac 10.6.8
Currently Being ModeratedJan 29, 2012 11:07 AM (in response to Doug Stringham)
Yes but on my imac (10.7.2), my vtdecoderservice randomly and repeatedly launches the soundtrack of a video of a CNC machine I recorded even though I'm fairly certain I deleleted that! A virus? I've run Sophos, Cleanmymac and Disk Utility (and Mackeeper until I was advised to remove that) and I've restarted with PRAM held down - none of which change this problem. The sound appears weven when there are no other progs running. I'm at a loss how to stop this. Apple: any ideas? Users: any one else had this weird thing?
Currently Being ModeratedApr 28, 2012 5:27 AM (in response to creativemessdev)
I had this as well ie VTDecoderXPCService running lots of CPU while the trackpad control panel preference is open.
Took me a while to realise though!
Currently Being ModeratedOct 30, 2013 9:15 AM (in response to Doug Stringham)
Skype can do the same (i.e. trigger VTD and keep it running at 25% CPU) if it leaves the FaceTime camera active. After a Skype session last night, I noticed my camera LED was still on, and VTD was chewing CPU cycles. Killed Skype - all gone.