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Don't really seem to see the issue on mine. I mean it has hung on that screen once or twice but a refresh and I was able to play fine.

Btw I have clicktoflash plugin so it mainly goes to HTML 5 whenever it can.
 
I had that happen for the first time today when I tried playing the new Cortana video on the Macrumors home page.

I've been using Chrome for when things just don't work right in Safari, and in Chrome they do just seem to work right. Been using it more and more.

RIGHT??? - Never saw it until I played THAT video. Its a Microsoft bug embedded in the video.
 
Same here, started this evening. Video loads, then a high pitched sound appears for one second and then the video is displayed as being 0 seconds long. Is Safari specific, I got Chrome instead and it works fine. Also tried reinstalling Flash Player, didn't work.
 
I have literally spent the last hour troubleshooting this, and JUST refreshed Macrumors to post in the forums, and bam! Here's the EXACT issue I'm experiencing.

Basically, HTML 5 playback is utterly broken in Safari right now on my 5K iMac running 10.10.1. I get a little SQUEAL sound when I try and play a video, and then nothing. Safari freezes, and I have to quit it.

Ugh... what is going on at Apple these days?

Yep, I get the squeal sound too then it just errors out.
 
I somehow fixed this by running MacKeeper to clean everything out. I still see a brief second of the black box error ("An error occurred.."), but then the video plays just fine.

Also noticing some warbling audio blips. Annoying and loud.
 
Guys, what's seemed to work for me is signing out of google in YouTube. After I did that the videos worked fine, but as soon as I logged back in, videos weren't working again. Maybe a short term fix for some people
 
I think this article is not entirely accurate. The issue has nothing to do with 10.10.1.
It seems that YouTube is experiencing issues, that affect Safari mostly, but also on Chrome YouTube has become very slow..
 
For the "workaround" I found selecting Firefox - Mac works better than Chrome. With Chrome I was getting some weird issues
 
Me too but they don't fail to play consistently. Some do and some don't.

Also, has anyone had very similar Youtube issues on their iPhone? I've been having terrible playback on my 6+ ever since 8.1.
 
If it has just started happening this evening, after having played videos with no issues since the update, then surely that would mean something has been changed on the Youtube side that is interferring with Safari. Otherwise the issue would have occurred before now, you would think.
 
Guys, what's seemed to work for me is signing out of google in YouTube. After I did that the videos worked fine, but as soon as I logged back in, videos weren't working again. Maybe a short term fix for some people

narp.

Tried that, didn't work for me.
 
Aha! So it's not just me!

Funny: I've been running 10.10.1 since the day it came out, and only today this odd behavior started. Couldn't this be something recently done on Google's side?
 
If YouTube has worked fine on 10.10.1 before and nothing has changed with the OS since then, then how is this Apple's fault exactly?

Additionally, if the problem can be mitigated by changing the user agent to Chrome then I don't see how this is a problem with Safari.

It seems like it is a problem with YouTube to me.
 
just noticed this an hour ago. The MAcRumors story under this on the homepage has a youtube embed that fails just like the article describes. Great. :p
 
Same 10.10.0

I am seeing the same issue in safari on a 2013 iMac running 10.10.0
 
If YouTube has worked fine on 10.10.1 before and nothing has changed with the OS since then, then how is this Apple's fault exactly?

Additionally, if the problem can be mitigated by changing the user agent to Chrome then I don't see how this is a problem with Safari.

It seems like it is a problem with YouTube to me.

Yes, I think it's a Youtube update of some description. Google conspiracies start ... now
 
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