Author Topic: 8k youtube  (Read 3632 times)

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Offline grifftech

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8k youtube
« on: November 01, 2017, 07:11:15 pm »
I watched part of a video in 8k 60fps, and in the first 35 seconds it dropped  928/1841 frames.
 

Offline kalel

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Re: 8k youtube
« Reply #1 on: November 01, 2017, 07:23:53 pm »
350/900 (rounded values)

But it drops frames when I click pause, drops during loading... It's unwatchable.
I'm not sure what's the point of 8k at this point, other than 'just for fun', or maybe just for benchmarks or advertising purposes of new devices. Ah, possibly preparing for virtual reality devices, they really need a high resolution.

8k might work on GPUs that are optimized for 8k, but even then, 8k monitors, connection speeds, HTML 5 are all an issue.
I doubt that HTML 5 rendering is well suited for 8k.

That said, the 30 frames version is completely watchable using an external player capable of YouTube playback (60 frames doesn't even work). Does it look great on an 1080p monitor? It looks sharp, but aliased. I'm sure that a quality encoded 1080p video could look better.
« Last Edit: November 01, 2017, 07:28:13 pm by kalel »
 

Online HighVoltage

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Re: 8k youtube
« Reply #2 on: November 01, 2017, 07:46:57 pm »
I have enjoyed this video about PERU a lot, since I visited most of those places in 2014
What a country!

And as an engineer I am not able to explain some of the ancient stuff
There are 3 kinds of people in this world, those who can count and those who can not.
 

Offline Howardlong

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Re: 8k youtube
« Reply #3 on: November 01, 2017, 08:15:21 pm »
I achieved zero dropped frames.

CPU usage was about 25% of a single core (24C/48T dual Xeon E5-2696v2).

GPU was only active on one card at 80 to 95% video engine load (machine has 2 x GTX 1070 in SLI, but performance balanced for cryptocurrency).




 

Offline nidlaX

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Re: 8k youtube
« Reply #4 on: November 01, 2017, 08:52:36 pm »
If you have a video card that handles hardware decoding of VP9, then you should in theory have no trouble playing back 4K, or even 8K files on YouTube.

Your browser, on the other hand, can completely spoil it for you if it does not support the right hardware acceleration. On Windows 10, I find that Edge will reliably playback videos with hardware accelerated decoding, whereas Chrome will sometimes struggle.
 

Offline EEVblog

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Re: 8k youtube
« Reply #5 on: November 01, 2017, 09:03:23 pm »
And here I am only now contemplating moving to 4K 30fps  ::)
 

Offline thm_w

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Re: 8k youtube
« Reply #6 on: November 01, 2017, 09:46:01 pm »
Do you have one of these? https://www.bhphotovideo.com/c/product/1324922-REG/dell_up3218k_ultrasharp_32_ultra.html

Otherwise, not sure how you can watch it in 8K.
 

Offline Halcyon

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Re: 8k youtube
« Reply #7 on: November 01, 2017, 09:55:52 pm »
And here I am only now contemplating moving to 4K 30fps  ::)

Don't forget some of us are on Australia's new National Broadband Network, so we can barely manage 1080P.
 

Offline EEVblog

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Re: 8k youtube
« Reply #8 on: November 01, 2017, 10:02:05 pm »
And here I am only now contemplating moving to 4K 30fps  ::)
Don't forget some of us are on Australia's new National Broadband Network, so we can barely manage 1080P.

A 4k source should give you a better quality 1080p image
 

Offline mariush

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Re: 8k youtube
« Reply #9 on: November 01, 2017, 10:23:07 pm »
The recent video cards  - Polaris series from AMD (the ones with RX in name) and the Pascal series from nVidia (GTX 1xxx ) -  have hardware decoders which can decode the videos completely on the video card without using the processor on your computer.

Youtube uses two codecs to encode their videos : VP9 and h264 for backwards compatibility. For 4K and higher, it mostly uses VP9 to encode videos which requires more processing power to decode.

Even these video cards have some limitations.
The Pascal cards I think can decode 8K h264 content completely in hardware but VP9 is limited to 4K (later edit: it could be 8K on higher end cards like GTX1070 or GTX 1080 i admit i didn't keep up with various versions of cards) . So the 8K may be decoded only using your processor.

The Polaris (AMD) cards can decode 4K h264 content completely in hardware and maybe 8K, I'm not sure. 
VP9 is not decoded 100% in hardware, it's a sort of hybrid decoding, some decoding is done on the video card and some on the processor.  8K I think it's decoded strictly using the processor in the computer but I may be wrong.

I have a RX 470... I just tested with a 4K video and at least on Firefox, 4K VP9 is decoded strictly using cpu, with my old FX-8320 it stays at around 30 to 45% of processor and I get no dropped frames. Same with Opera, I see 0% gpu usage and 20 to 30% cpu usage (probably some cpu usage was other tabs in Firefox). Maybe Chrome uses hybrid decoding if you enable it from settings, or maybe hybrid decoding is only supported in Windows 10 ... I have Windows 7 and don't want to install Windows 10.

I can understand that 8K would not play smoothly since it's 4 times the amount of pixels on screen, so the cpu would probably be at 100% all the time.

Newer processors like let's say a six core or eight core Ryzen processor could probably decode 8K VP9 using the processor without dropped frames.

8K h264 is easier to decode using the processor, my FX-8320 can mostly handle it (has some dropped frames from time to time but not unwatchable)

// also these modern cards can also do 4K 60 fps 10bit HEVC in hardware but Youtube and others don't support it because it costs money in licensing and there's no decoders in browsers.
« Last Edit: November 01, 2017, 10:30:07 pm by mariush »
 

Offline Halcyon

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Re: 8k youtube
« Reply #10 on: November 01, 2017, 10:28:04 pm »
And here I am only now contemplating moving to 4K 30fps  ::)
Don't forget some of us are on Australia's new National Broadband Network, so we can barely manage 1080P.

A 4k source should give you a better quality 1080p image

I know, I was just pointing out that our FTTN connections suck ;-)
 

Offline kalel

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Re: 8k youtube
« Reply #11 on: November 01, 2017, 10:44:14 pm »
And here I am only now contemplating moving to 4K 30fps  ::)
Don't forget some of us are on Australia's new National Broadband Network, so we can barely manage 1080P.

A 4k source should give you a better quality 1080p image

Yes, when watching 4k on 1080p monitor you do get a better image because YouTube then allows for a higher bitrate.

But if you can only watch the 1080p quality setting for whatever reason (connection, mobile device, etc) will the quality be the same as if the source was uploaded at 1080p, worse, or better?
 

Offline EEVblog

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Re: 8k youtube
« Reply #12 on: November 01, 2017, 11:45:04 pm »
But if you can only watch the 1080p quality setting for whatever reason (connection, mobile device, etc) will the quality be the same as if the source was uploaded at 1080p, worse, or better?

People say it's better due to how Youtube handles the internal renders.
 

Offline EEVblog

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Re: 8k youtube
« Reply #13 on: November 02, 2017, 12:48:33 am »
If you had to choose between 1080p at 60fps or 4K at 30fps, which would you choose? Resolution or fps? With my humble setup I can't handle 60fps at 1080P and I don't have a 4K monitor. Or 4K eyesight for that matter.

For stuff like teardowns, 4K would be handy for seeing detail.
Anyway, Sony have a new camera coming out in December that I like that does 4K 30fps or 1080P up to 120fps
 

Offline coppice

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Re: 8k youtube
« Reply #14 on: November 02, 2017, 12:54:26 am »
If you had to choose between 1080p at 60fps or 4K at 30fps, which would you choose? Resolution or fps? With my humble setup I can't handle 60fps at 1080P and I don't have a 4K monitor. Or 4K eyesight for that matter.
It depends a lot on the material. Fast moving stuff benefits from 60fps, and you can't see that much detail, so 4k isn't much of a win. Slow moving stuff looks similar at 30fps and 60fps, but 4k resolution really shines. For a lot of material the biggest benefit of the latest 4k + HDR (high dynamic range) TVs is the HDR part. HDR doesn't add much to indoor scenes, but it really improves a lot of outdoor stuff.
 

Offline Halcyon

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Re: 8k youtube
« Reply #15 on: November 02, 2017, 12:58:13 am »
For the type of content Dave shoots, I'd choose 4K (or the highest possible resolution). That way the master recordings can be archived in the higher resolution and released later if the need arises. It's also useful for taking stills from video.
 

Offline rs20

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Re: 8k youtube
« Reply #16 on: November 02, 2017, 01:18:40 am »
If you had to choose between 1080p at 60fps or 4K at 30fps, which would you choose? Resolution or fps? With my humble setup I can't handle 60fps at 1080P and I don't have a 4K monitor. Or 4K eyesight for that matter.

It depends on the content. One of my pet peeves is people (and marketers) pushing so hard on 4K and completely ignoring 60 fps; when most of us have 1080p60 monitors and a lot of content (sports, dancing) benefits VASTLY more from 60fps than 4K (not to mention a large amount of "4K" footage being taken by optics and camera operators that aren't capable of delivering 4K worth of sharpness, while 60fps doesn't require any special operator skill or optical quality |O)
 

Offline edy

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Re: 8k youtube
« Reply #17 on: November 02, 2017, 02:02:53 am »
Speaking of 60fps... I have a few BLUERAY Hollywood movies that are encoded in what I assume is 60fps, and when they are played on the TV the movies appear too "sharp" and "video-like" instead of looking like movies. Something is lost... I can't tell what exactly, but my brain can tell and it looks too real and therefore almost "fake" (almost counter-intuitive). Can anyone put into words what exactly is happening when we watch these Hollywood movies at 60 fps and why they start taking on a "video" like quality and lose the "movie" quality?

Is it something to do with motion blur, and at 60 fps the movie has no blur at all? Or does the 30fps version introduce motion blur somehow when they are converting the movie over? I am assuming movies are all shot digitally these days at 60fps anyways and then "down-scaled" to 30fps but introducing motion blur digitally?

[EDIT:  Added comment..... It takes me in to the "uncanny valley" sort of feeling]
« Last Edit: November 02, 2017, 02:34:57 am by edy »
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Offline rdl

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Re: 8k youtube
« Reply #18 on: November 02, 2017, 02:19:45 am »
It's probably just your brain saying "this does not look like a movie". Most people can see a noticeable difference between 60 fps and the 24/25/30 fps they are used to.
 

Offline nidlaX

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Re: 8k youtube
« Reply #19 on: November 02, 2017, 02:31:27 am »
When you select a playback resolution higher than your viewport, you might be trading better bitrate with fewer motion artifacts for worse resolution due to a fast downsampling algorithm. Just take a look at how the 8K video looks when it's embedded and not fullscreen.
 

Offline Jim Kwik

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Re: 8k youtube
« Reply #20 on: November 02, 2017, 03:26:15 am »
While I turn to the 4320P, my Google Chrome got stuck.  :(
There are no accident.
 

Offline Howardlong

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Re: 8k youtube
« Reply #21 on: November 02, 2017, 06:05:55 am »
If you have a video card that handles hardware decoding of VP9, then you should in theory have no trouble playing back 4K, or even 8K files on YouTube.

Your browser, on the other hand, can completely spoil it for you if it does not support the right hardware acceleration. On Windows 10, I find that Edge will reliably playback videos with hardware accelerated decoding, whereas Chrome will sometimes struggle.

I find exactly the same, FWIW, which is somewhat bizarre as I’d have thought Google would be chomping at the bit to get Chrome working with Youtube at these higher resolutions. IE nowadays will do upto 1080p60 but that’s it.
 

Offline Howardlong

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Re: 8k youtube
« Reply #22 on: November 02, 2017, 06:19:41 am »
Regarding 4k30 vs 1080p60, I have to say I tend to prefer the buttery smoothness of the higher framerate.

What is of value, assuming your source bitrate and quality is good enough, is upsampling higher bitrate 1080p60 to 4k60 and using that, as Youtube limits bandwidth according to resolution. The downside is that rendering times suffer dramatically of course.

There’s also a school of though that says shooting wide at 4k allowing you to post process framing and add effects like panning, zooming and multi-camera despite there being only a single source. All of that sounds too much like hard work to me though!

I’m somewhat surprised at the slowness of reasonably priced 4k60 sources to become available. There are a couple of action cams now but they’re useless for indoor use and close ups. The Panasonic GH5 is the only decent game in town sub $2k, but you can add substantially to that for the right lenses if you’re not already in the micro 4/3 space.
 

Offline blueskull

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Re: 8k youtube
« Reply #23 on: November 02, 2017, 06:36:21 am »
Newer processors like let's say a six core or eight core Ryzen processor could probably decode 8K VP9 using the processor without dropped frames.

I experience crazy frame dropping and extreme sluggishness with my Xeon E5-2696v4 (OEM version of 2699v4, the third fastest CPU that can run on a consumer mobo, only next to i9-7980XE and TR 1950X), 64GB Reg ECC, Chrome, Windows 10 1703 64-bit.
 

Offline mariush

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Re: 8k youtube
« Reply #24 on: November 02, 2017, 07:42:30 am »


I experience crazy frame dropping and extreme sluggishness with my Xeon E5-2696v4 (OEM version of 2699v4, the third fastest CPU that can run on a consumer mobo, only next to i9-7980XE and TR 1950X), 64GB Reg ECC, Chrome, Windows 10 1703 64-bit.

The decoder may be poorly multithreaded or theres some serial stuff which slows down decoding. Your CPU has lots of cores but base frequency of 2.2 ghz and boost at 3.6ghz

A Ryzen 6 core or higher will have base frequency at 3.2 ghz or higher .. r5 1400 (4/8) is 3.2 base /3.4 boost , 1500x (4/8) is 3.5/3.7, r5 1600x (6/12) is 3.6/4.0 .. even r7 1700 (8/16) is 3.0/3.7
 


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