Safari not able to play new 4K videos from YouTube homepage, likely due to VP9 shift
What appears to be Google's shift to the VP9 codec for delivering 4K video on the YouTube homepage is preventing Safari users from watching videos uploaded to the service since early December in full 4K resolution, but not from viewing webpage-embedded videos in the same resolution.

The shift appears to have taken place on Dec. 6, according to a Reddit thread delving into the issue. Google has been pushing the open and royalty-free VP9 codec as an alternative to the paid H.265 spec since 2014, but has never said that it would stop offering 4K video on the YouTube site in other formats, like the Apple-preferred H.264.
Videos uploaded to the service prior to Dec. 6 in 4K resolution can still play back in full 4K resolution on Safari from the YouTube homepage. Additionally, Mac users utilizing Chrome still have the ability to play back new videos in 4K, as Safari is the only holdout among the major browsers that doesn't support the codec.
However, further confusing the issue, a new video embedded in a webpage such as the 4K video of the Apple Campus flyover from Wednesday, can still be played back in the embed in 4K. Shifting to the YouTube homepage to view the video reverts to a maximum 1440p resolution.
The issue manifests on all Apple hardware, regardless of OS revision, or Safari version. Specific platforms tested by AppleInsider include a 2012 Retina MacBook Pro, a 2016 Retina MacBook Pro, and a Mac Pro with 4K display.
"We haven't supported VP9 in Safari," we were told by a representative from Apple corporate. "[Google] has seemingly made a conscious decision to not stream H.264 4K video to Apple users from the YouTube homepage, when it clearly could if it chose to."
We have reached out to Google regarding the matter, and have yet to receive a response.

The shift appears to have taken place on Dec. 6, according to a Reddit thread delving into the issue. Google has been pushing the open and royalty-free VP9 codec as an alternative to the paid H.265 spec since 2014, but has never said that it would stop offering 4K video on the YouTube site in other formats, like the Apple-preferred H.264.
Videos uploaded to the service prior to Dec. 6 in 4K resolution can still play back in full 4K resolution on Safari from the YouTube homepage. Additionally, Mac users utilizing Chrome still have the ability to play back new videos in 4K, as Safari is the only holdout among the major browsers that doesn't support the codec.
However, further confusing the issue, a new video embedded in a webpage such as the 4K video of the Apple Campus flyover from Wednesday, can still be played back in the embed in 4K. Shifting to the YouTube homepage to view the video reverts to a maximum 1440p resolution.
Apple Campus drone flyover, uploaded January 12, note lack of 4K option on YouTube homepage
4K video of Apple Campus posted in October, note 4K option on YouTube homepage
The issue manifests on all Apple hardware, regardless of OS revision, or Safari version. Specific platforms tested by AppleInsider include a 2012 Retina MacBook Pro, a 2016 Retina MacBook Pro, and a Mac Pro with 4K display.
"We haven't supported VP9 in Safari," we were told by a representative from Apple corporate. "[Google] has seemingly made a conscious decision to not stream H.264 4K video to Apple users from the YouTube homepage, when it clearly could if it chose to."
We have reached out to Google regarding the matter, and have yet to receive a response.
Comments
Get on message Apple.
AFAIK, VP9 is Open and royalty free
https://en.wikipedia.org/wiki/VP9
so why can't Apple adopt it? Pride?
Something limiting or disappointing about Safari???
I'm shocked!
/s
Google's play with VP9 is only possible because certain hardware makers have not yet invested in H.265.
Not only have they not given up on it, but they've doubled down on it.
Google doesn't want to pay royalties to licensors—and who can blame them?—but it does lead to issues for customers and potential anti-trust issues if this forces those wanting to continue to use YouTube to then install a Google made OS or browser in order to watch content. AV1 seems better suited to challenge HEVC and its potentially high costs, but like we've seen before the threat of MPEG patent holders losing ground opened up the rights considerably so AV1 may never actual gain any real ground while still being impactful.
Well, thanks for the insults. Apparently those of us who are not acquainted with CODEC licensing issues are beneath you? Or worse, deliberately disruptive?
@Rotateleftbyte, I thought your question was reasonable. I'm having problems with Apple not supporting a couple common and widely used CODECS. Two of their choices over the last couple years have had a serious impact on me, so I'm interested in knowing what's going on at Apple around choosing what they support, what they don't, and the reasons for the choices.
I don't use YouTube for much other than how to videos and repair projects. I would rather go to a legitimate source for content such as iTunes, Amazon, Netflix and DIRECTV. The 4K support by YouTube is a non-issue for me.
And if people stop watching YouTube, Google will step up to the plate.
I am certain that Facebook supports H.264
and that's far more important than whether YouTube does.
YouTube doesn't have that much clout. H.264 is standard and legal. VP9 is an attempt again by Google to usurp intellectual property. It is pathetic to watch a company like them resort to these types of unsavory and frankly pathetic practices.
Once Facebook or Amazon develops an competitive model, I won't be using YouTube at all.
2) Whether there is evidence or not, the threat of VP infringing on MPEG and other patent holder's algorithms and codes are still very real. As we've seen with patent trolls, you can sit on even an unused patent for many years and then sue them in the Eastern District of Texas for royalties on every device ever sold. Google could have made their open license a writ of protection against any and all lawsuits that may arise from those that implement VP codecs. That said, every major company that designs processor architecture supports HW-based VP9 decoding, with some chips supporting HW-based VP9-encoding. Then you have AV1 coming as an extension of VP9 later this year with major backers like Amazon, Netflix, and Alphabet (YouTube) you probably have most of the video traffic being served, so that looks promising.