YouTube in 4K 60 fps: technical details?

[Romano2K]

Hi there!

As many of you may be aware, YouTube started experimenting streaming of 60 fps 4K videos, as TechCrunch reported last week: http://techcrunch.com/2015/03/26/youtube-is-experimenting-with-ultra-high-def-ultra-sm...-the-examples/

Unfortunately, none of the websites that wrote about the news digged is really techy. We don't know which codec is used, what's the bitrate, etc.

I can't get to download the file so I'm not able to analyse it with MediaInfo or something similar, is anyone able to do it?

[AllisOne]

You can download them using for example a Firefox addon - Complete YouTube Saver:
http://www.cys-audiovideodownloader.com/
or
https://addons.mozilla.org/en-US/firefox/addon/complete-youtube-saver/

First you need to go to 'Options' to download/install ffmpeg and tick all formats/containers/qualities you want to choose from.

[poisondeathray]

The UHD 60p version is VP9 only, ~27Mbps

youtube-dl can download them

.
.


313          webm       3840x2160  DASH video 20194k , VP9, 30fps, video only, 428.05MiB
266          mp4        3840x2160  DASH video 22421k , h264, 30fps, video only, 554.16MiB
138          mp4        3840x2160  DASH video 24078k , 30fps, video only, 500.07MiB
272          webm       3840x2160  DASH video 25237k , 30fps, video only, 493.59MiB
315          webm       3840x2160  DASH video 27327k , VP9, 60fps, video only, 611.41MiB

[Romano2K]

You can download them using for example a Firefox addon - Complete YouTube Saver:
http://www.cys-audiovideodownloader.com/
or
https://addons.mozilla.org/en-US/firefox/addon/complete-youtube-saver/

First you need to go to 'Options' to download/install ffmpeg and tick all formats/containers/qualities you want to choose from.

I discovered this tool after browsing the forum randomly, I'm sorry.

It works great, so thank you.

The UHD 60p version is VP9 only, ~27Mbps

youtube-dl can download them

.
.


313          webm       3840x2160  DASH video 20194k , VP9, 30fps, video only, 428.05MiB
266          mp4        3840x2160  DASH video 22421k , h264, 30fps, video only, 554.16MiB
138          mp4        3840x2160  DASH video 24078k , 30fps, video only, 500.07MiB
272          webm       3840x2160  DASH video 25237k , 30fps, video only, 493.59MiB
315          webm       3840x2160  DASH video 27327k , VP9, 60fps, video only, 611.41MiB

This tool looks very cool too, I like the CLI. I'm going to install it on my VPS. Thank you too.

[newpball]

Here is a 4K/60P clip.

For 4K it gives me a VP9 bitrate of 20Mbps (but sometimes chokes due to lack of bandwidth), QHD works great and consistently and has a VP9 bitrate of about 15Mbs.

[rubbish]

Even my Retina MacBook Pro is struggling to play YouTube's 4K60. Iris Pro isn't so great after all, I guess.


Sent from my iPhone using Tapatalk

[Romano2K]

The problem is that 4K 60p is only VP9 at the moment. And that this video codec isn't hardware decoded by any CPU/GPU to my knowledge. Your latest generation MacBook will play 4K 60p videos fine when they'll be streamed in AVC (H.264) or HEVC.

[rubbish]

Thanks.

I've exported 4K60 from Premiere Pro just for the fun of it in H.264 and my Mac plays it just fine, so you're right about VP9.


Sent from my iPhone using Tapatalk