4k test internet channels
 

Are there any free 4K test internet channels?

Might I be able to view at a reduced resolution on my PC?


--
Michael Chare

4k test internet channels
 

Michael Chare wrote:
Are there any free 4K test internet channels?

I don't know about test channels, but there are some samples available -

http://demo-uhd3d.com

Might I be able to view at a reduced resolution on my PC?

For the h264 samples I would say yes, but then I don't know the specs of
your PC.

Many samples are high bitrate HEVC (h265) these are far harder currently
for a PC. ffmpegs hevc decoder is not as optimised as it could be. The
very latest Intel CPUs and AMD/Nvidia APUs and GPUs have some hardware
decoding capability, but I don't know how well it works and 10 bit
samples don't seem to be supported.

4k test internet channels
 

On 17/10/2015 00:28, Andy Furniss wrote:
Michael Chare wrote:
Are there any free 4K test internet channels?

I don't know about test channels, but there are some samples available -

http://demo-uhd3d.com

Might I be able to view at a reduced resolution on my PC?

For the h264 samples I would say yes, but then I don't know the specs of
your PC.

Many samples are high bitrate HEVC (h265) these are far harder currently
for a PC. ffmpegs hevc decoder is not as optimised as it could be. The
very latest Intel CPUs and AMD/Nvidia APUs and GPUs have some hardware
decoding capability, but I don't know how well it works and 10 bit
samples don't seem to be supported.

Thank you. I have tried playing with VLC and it nearly works. I get bits
of the image on the screen if I pause the display and then move back a
little bit. My screen does 2560*1440 driven by an AMD Radeon HD 5670.

--
Michael Chare

4k test internet channels
 

On Friday, 16 October 2015 23:53:52 UTC+1, Michael Chare wrote:
Are there any free 4K test internet channels?

Might I be able to view at a reduced resolution on my PC?


--
Michael Chare

Have a look at Jupiter
https://www.youtube.com/watch?v=3afEX8a2jPg

Worked pretty well here apart from a bit of tearing when the shot changed, probably due to my broadband (only 30 odd Mbps) not quite keeping up.

FYI

PC AMD A8-7600 on Asrock A88X Extreme6+ MB, 8Gb RAM, on board graphics
s/w Win 8.1pro, AMD drivers
BB BT I2 via wired Hub5
display port to Iiyama monitor [email protected]

4k test internet channels
 

R. Mark Clayton wrote:
On Friday, 16 October 2015 23:53:52 UTC+1, Michael Chare wrote:
Are there any free 4K test internet channels?

Might I be able to view at a reduced resolution on my PC?


-- Michael Chare

Have a look at Jupiter https://www.youtube.com/watch?v=3afEX8a2jPg

Worked pretty well here apart from a bit of tearing when the shot
changed, probably due to my broadband (only 30 odd Mbps) not quite
keeping up.

Not really in the same league as a lot of UHD though.

30 fps, 11 mbit h264 or 8 mbit VP9, on my old phenom II 965 I can decode
those at 120/99 fps.

If your browser uses google webm decoder for VP9 you won't be as fast
though, that was with ffmpeg which is quite a bit faster.

60 fps 50 mbit hevc, like some demos are, is a lot more challenging!

For those with in between res screens like the OP at least youtube has
some variety -

youtube-dl --list-formats https://www.youtube.com/watch?v=3afEX8a2jPg
[youtube] 3afEX8a2jPg: Downloading webpage
[youtube] 3afEX8a2jPg: Extracting video information
[youtube] 3afEX8a2jPg: Downloading DASH manifest
[info] Available formats for 3afEX8a2jPg:
format code extension resolution note
249 webm audio only DASH audio , opus @ 50k
250 webm audio only DASH audio , opus @ 70k
251 webm audio only DASH audio , opus @160k
171 webm audio only DASH audio 126k , [email protected]
(44100Hz), 879.61KiB
140 m4a audio only DASH audio 127k , m4a_dash
container, aac @128k (44100Hz), 951.82KiB
278 webm 256x144 DASH video 93k , webm container,
VP9, 15fps, video only, 641.91KiB
160 mp4 256x144 DASH video 110k , 15fps, video only,
815.98KiB
242 webm 426x240 DASH video 121k , 30fps, video only,
647.59KiB
243 webm 640x360 DASH video 206k , 30fps, video only,
1.13MiB
133 mp4 426x240 DASH video 245k , 30fps, video only,
1.78MiB
134 mp4 640x360 DASH video 260k , 30fps, video only,
1.62MiB
244 webm 854x480 DASH video 340k , 30fps, video only,
1.80MiB
135 mp4 854x480 DASH video 530k , 30fps, video only,
3.43MiB
247 webm 1280x720 DASH video 626k , 30fps, video only,
3.48MiB
136 mp4 1280x720 DASH video 1011k , 30fps, video only,
6.77MiB
248 webm 1920x1080 DASH video 1155k , 30fps, video only,
6.79MiB
137 mp4 1920x1080 DASH video 1968k , 30fps, video only,
12.47MiB
271 webm 2560x1440 DASH video 4125k , 30fps, video only,
20.36MiB
264 mp4 2560x1440 DASH video 6083k , 30fps, video only,
32.42MiB
313 webm 3840x2160 DASH video 10553k , VP9, 30fps, video
only, 54.70MiB
266 mp4 3840x2160 DASH video 15625k , h264, 30fps,
video only, 76.47MiB
17 3gp 176x144
36 3gp 320x240
5 flv 400x240
43 webm 640x360
18 mp4 640x360
22 mp4 1280x720 (best)

4k test internet channels
 

Michael Chare wrote:
On 17/10/2015 00:28, Andy Furniss wrote:
Michael Chare wrote:
Are there any free 4K test internet channels?

I don't know about test channels, but there are some samples
available -

http://demo-uhd3d.com

Might I be able to view at a reduced resolution on my PC?

For the h264 samples I would say yes, but then I don't know the
specs of your PC.

Many samples are high bitrate HEVC (h265) these are far harder
currently for a PC. ffmpegs hevc decoder is not as optimised as it
could be. The very latest Intel CPUs and AMD/Nvidia APUs and GPUs
have some hardware decoding capability, but I don't know how well
it works and 10 bit samples don't seem to be supported.

Thank you. I have tried playing with VLC and it nearly works. I get
bits of the image on the screen if I pause the display and then move
back a little bit. My screen does 2560*1440 driven by an AMD Radeon
HD 5670.

There is quite a variety of samples. HEVC probably just can't be decoded
fast enough. H264 probably can, but your hardware won't decode above HD
so it's up to your CPU.
I am not really familiar with VLC on Windows but if you can't quite play
some H264 sample it may be worth messing around with/checking some
settings so that at least the scale and colour space conversion is done
on GPU. This may already be the case of course.

4k test internet channels
 

On 16/10/2015 23:53, Michael Chare wrote:
Are there any free 4K test internet channels?

Might I be able to view at a reduced resolution on my PC?



One of the blogs I subscribe to regularly posts 4K videos from Japan.

http://akihabaranews.com/tags/4k