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You can report this issue to Youtube by clicking on the sending feedback link at the bottom of any youtube.com page.

No reason to report it to Youtube if Youtube works just fine in Chrome, Opera, & Firefox. Hell even Camino works fine albeit slower.

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Either go to youtube.com/html5 and opt-out of the trial, or install a converter, like "Click to Plugin" which does the conversion in house.

The vast majority of computer users in general, unlike the people here, don't know whether they're seeing FLASH or HTML5 video.

They simply want it to work. I've resorted to using Firefox on a lot of streaming sites now as Safari simply coughs up a hairball on a several.
 
i'm having trouble with this right now. Bugs, a lot of bugs, apple is the brand of the bugs, apple is just unable to release a single version of any software they make without a lot of bugs, there's always a lot of bugs! looks like they don't even test it, i'm seriously full of this... even Android and Windows have a LOT LESS bugs than iOS and Mac :mad: :mad: :mad: :mad: :mad: :mad: :mad:
 
I think it's most likely Google's doing.
Since you can solve the problem by simply changing Safari's user agent to Chrome.
Also, I didn't have this problem at all until a few hours ago.

Until they fix the problem, you might want to try ClickToFlash.
The extension seems to fix the problem, and allow Safari to play Youtube video again.
http://hoyois.github.io/safariextensions/clicktoplugin/
 
I stopped using Youtube on my mac because it requires Flash, unless I switch to make youtube think I am on a iPad. Google/Youtube is still in the 80 with that flash crap. if you switch in the dev menu to the iPad client, you force youtube t send you the videos differently and then it works for me. I don't even have flash installed on my computer any more.

But until youboob/goggles eliminates the flush requirement, I am avoiding them altogether (sorry about the misspellings - well not really. :D)

Get Chrome. Yes, it still uses Flash but it's built in and NOT the plugin that other browsers use. The point is that you can open it, watch the video, and close Chrome right then and there.

That allows you to view content while keeping you other browsers from playing Flash stuff on random pages.
 
Epic fail

Im really not happy with Apple lately - its just one thing after another from the iOS update bugs, new mac minis with soldered in ram non user upgradable, yosemite bugs, I'm about ready to downgrade to mavericks - it worked great for me and now I have 16gigs of ram almost all used up on both my macs since the yosemite upgrade. I have a 2011 quad core i7 mac mini and a 2013 retina mbp with 1tb ssd. I resorted to clean install and manually installing my apps and works ok but not as good as before with mavericks. Upgrading is suppose to add more features and perform better but it has fared well for me.
 
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OS 10.10.1 issues

I too have experienced issues with the latest upgrade, and my solution has been to simply revert to an earlier operating system. Its disruptive but a functional short term fix while the tech sorts itself out.

You have to remember that these updates have to take into account an almost infinite set of variations among users, and it takes a while to sort itself out. I experienced something similar with the last update, only to find that it was the router that was the true culprit: apparently it interacted differently with the update than it did with the previous version of OS X 10.

In the meantime, don't let the perfect be the enemy of the good. Just a few months ago most everyone was still using Mavericks, anyway.
 
This happened on my hackintosh running Mountain Lion. I thought it was a sign that Google/YouTube was forcing me to upgrade my hackintosh. The error said that my Safari was out of date and to get the latest browser. Looks like people are getting similar problems on Yosemite so this is definitely a Google problem.
 
Adblock

People that are having this issue are you using adblock? I am seeing this issue but i assumed it was an issue with adblock so if I just pause adblock and refresh the page the video plays. Anyone else have luck with doing that?
 
working now?

It seems to be working now for me now. not sure what I did. I updated flash player earlier but that didn't work. But now it's just magically fixed
 
Chrome/Chromium

I'm having a similar problem with the new 64-bit version of Chrome. Videos play properly in small format, but if I try to expand them to full screen I get the black screen effect. Using the 64-bit beta version of Chromium I don't have this issue, videos play fine.
 
It's a combination of YouTube and Safari I think, as it works fine on Chrome.

Adblock as someone mentioned above might be worth investigating too, as I also have that installed.
 
Definitely a You Tube problem...we were having the same issue at work on IE...oddly enough, one person would have that error and the person next to them would be able to get on You Tube just fine and watch the same video with no error.
 
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?

I have invested a lot of money migrating to Apple over the last few years (iMac, MacBook's etc). Apple's software is a pathetic laughable joke so I'm not very impressed at all.

Lets put last years issues aside for a moment, the alarm bells started ringing at the broken mess Apple thought was acceptable to launch iOS 8 in, but as an early adopter to 10.10, should I/we really have to put up with such basic glitches and errors that shows Apple's QA is non-existent?

I don't know what is going on at Apple, but anyone working on software should be bloody ashamed of themselves. If any of Apple's software developers are reading this then I just want to say that your work over the last 18-24 month is woefully inadequate! The software Apple is shipping is clearly not ready for prime-time and whoever thought a new version of OS X each year was a good idea really shouldn't be employed any more. Sort it out.
 
Please explain to me why it worked fine last night but not this morning. Remember that your explanation needs to make it clear how it's Apple's fault.

Use small words since I'm having a hard time understanding.

I'm not talking specifically about this problem, I'm talking about all the other issues and annoyances that Apple failed to fix before shipping the software.

10.10.1 finally fixed the Finder crash on boot-up that I and many others had, so Apple did fix the number 1 issue I had with 10.10, but how can something like that get past testing?

And lets not forge the multitude of people who STILL have wi-fi issues. I personally am not affected by it, but I know plenty of people who are.
 
Im sure the youtube developer team need to review their last deployment.
They need to rollback.
 
It's funny this was reported today because the issue started happening today. Youtube has been working fine on 10.10.1 Safari since release.

Exactly. This just started. The knee-jerk “It’s Apple’s fault!” reaction is typical of the MacRumors crowd though. It’s one of the many reasons MacRumors has become a laughingstock in the Apple online world. The fact that changing the browser agent setting fixes it strongly implies the problem is at Google’s end. It means Google is detecting Safari and altering its stream.

This is a big enough issue that we’ll see a resolution sooner rather than later. It will be interesting to see the root cause. It’s a waiting game now.

And yes, for me it’s the HTML5 video that’s screwing up, not Flash content.
 
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