60fps Youtube Videos Stuttering

Not sure if this is related to graphics card drivers, adaptive sync, windows settings or perhaps belongs in a different forum section.

Since Youtube announced 1080p 60fps videos, I've noticed a few work but most of these appear to stutter severely during playback on my laptop. (Chrome v38.0.2125.111 m, Win 7 64-bit, Catalyst Version 14.4, Driver 14.10.1006-140417a-171098C, Catalyst Control Center 2014.0417.2226.38446)

Tried using internal laptop display as well as external monitor, no difference.

The following videos play fine 720p 60fps, but 1080p 60fps begins stuttering very badly as soon as the high resolution stream kicks in. I don't mean that they appear to lag, it's more like I can only see one frame every few seconds. If I slow down the playback speed in youtube player settings it plays smoothly again, normal speed or faster always appears to be a slideshow. Doesn't seem to be a buffering issue, as I've tried replaying these multiple times with the same result and I have 60Mbps Internet connection.
https://www.youtube.com/watch?v=_zPm3SSj6W8
https://www.youtube.com/watch?v=3KkB93EXSW4
https://www.youtube.com/watch?v=4eonRhUDj-o
https://www.youtube.com/watch?v=2oHLkcXnFVw


What's strange is that for whatever reason, the following videos play just fine at 1080p 60fps:
https://www.youtube.com/watch?v=7SRTEXSpcyI
https://www.youtube.com/watch?v=SumXU-uI_4A
https://www.youtube.com/watch?v=CFixQcIpMEs

Any ideas as to what might be causing this?

 

What's your CPU and memory usage like? Also try turning on/off hardware acceleration in Chrome.

 

If you didn't have an i7, I'd say your CPU couldn't decode the stream well enough. But that is indeed weird.

Edit: I can watch the vids you have problems with on 1080/60 just fine.

 

Play fine on a win8.1 tablet.

try different browser, check if you are on flash or HTML5

 

Wow, turning off hardware acceleration fixed it!

Before I turned off hardware acceleration, I was getting very low CPU usage when playing the videos that were stuttering, around 2% - 7%. The 60fps videos that played smoothly had around 40-50% CPU usage.

After turning off hardware acceleration the videos that didn't work previously jumped up to around 25-30% CPU usage.

Memory was pretty constant a little over 3GB.

 

Only chrome uses 60fps for youtube right now, so changing browser couldn't help.

 

Unless it lies.

 

You can check. 1/2 framerate updates in the decoded framerate box at the top left of the table below. If it updates in 15s then it's at 30fps; if it updates in 30s then it's at 60fps

Or you could watch the video and as a PC gamer probably be able to look.

Youtube themselves said that only chrome supports it atm, and firefox doesn't do it (as far as last night my friend couldn't get 60fps to show up on firefox) so.... *shrugs*. #Youtube

 

The eye test should be enough to tell whether it's 30 FPS or 60 FPS.

 

My eye test say yes. One of the uploader comment that Chrome, safari and IE should work.

 

I apologize, I momentarily forgot I was surrounded by actual gamers and answered as if I was talking to the people normally around me. I apologize deeply.

I shall never again list the eye test second.

 

Yea the announcement was Chrome and Explorer if I am not mistaken.

 

Man.. Mario looks so inviting. 60fps goes a long way.

 

How did you do that?

NEVERMIND. I found that it is in html5. Another question... why my Firefox doesn't digest h264 in html5?
EDIT: found the answer.