VTDecoderXPCService sucking up 25-30% of CPU

⚠note that when you disable VTDecoderXPCService some videos that needed decoding won't play.

Below are the steps i took to fix this issue:

1. When I tried to play a 1080p video file via QuickLook, it was choppy. I can see "VTDecoderXPCService" process in Activity Monitor.
2. After I disabled VTDecoderXPCService and rebooted my Mac, the video was no longer choppy. "VTDecoderXPCService" process in Activity Monitor no longer showed up.
3. However, when I tried to play a 4K video from Youtube (HTML 5, not Flash Player) the webpage freezes. When I force using Flash Player to play the 4K video the video lags. (of course, my MacBook Pro was underpowered for 4K videos)
4. I enabled VTDecoderXPCService and rebooted my Mac, and tried to play the same 1080p video file via QuickLook. It was not choppy and played just fine. Plus I didn't see "VTDecoderXPCService" process in Activity Monitor.
5. I tried playing the same 4K video from Youtube (HTML 5) and "VTDecoderXPCService" process in Activity Monitor appeared. It no longer freezes the webpage. The 4K video was choppy just as I thought because my MacBook Pro was underpowered for 4K videos.

ℹif you are unfamiliar with terminal:

try to disable VTDecoderXPCService by adding an extra extension or moving the VTDecoderXPCService file to another folder, DO NOT remove it!

and enable VTDecoderXPCService by removing the extra extension or moving that file back to the path nikok mentioned.

here's an update:

It seems like the issue appeared once again with I played the 1080p video, and of course "VTDecoderXPCService" process is in Activity Monitor.

I conducted a test to verify the issue:

I rebooted without renaming or moving the VTDecoderXPCService file, and the video played fine. Plus I didn't see "VTDecoderXPCService" process in Activity Monitor.

I think rebooting my mac temporarily solved the issue.

I'll try renaming or moving (disabling) the VTDecoderXPCService file next time, and without restoring (enabling) to see if this issue actually get solved.

I've experienced this issue with VTDecoderXPCService twice now. both times after using netflix in Safari. I restart seems to make it go away. But now I have 2 instances of the process running one using 27% CPU and another using 18% Must be percentage of one core because my overall CPU load is at 10%

As I was typing this a 3rd instance of the process appeared.

Does anyone have any suggestions on how to fix this? short of waiting for APPLE to release an OS patch.

To Doug, so does this mean you actually DID have this iCamSource app running, only you didn't notice it?

I had this issue while watching HD podcasts in iTunes in PiP mode on Sierra. Simply restarting iTunes has solved the issue ... for now at least!

On my machine what was causing high CPU usage was Photos in icloud being logged in and constantly syncing. Go into icloud in settings of your mac and untick the box for photos.

Thanks, quitting the process fixed this for me, too. But I wonder what is triggering it to begin with? For me it opening mail seems to trigger it.