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KT IPTV (olleh GiGA UHD tv) Service (3): 4-channel View
June 06, 2015 | By Dr. Harrison J. Son (tech@netmanias.com)
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KT IPTV (4K UHD) Service

(1) UHD Live TV

(2) 'Most Popular Channels Now' (9-Channel View)

(3) 4-channel View

(4) UHD VoD

 

KT also offers 4-channel view service. This service is pretty similar to LG U+'s and has the following two options:

  1. Operator-selected channels: Offers a set of 4 channels selected by operator (sports, shopping, over-the-air and movies).
  2. User-selected channels (launched in March 2015): Allows users to select 4 channels, and watch them in a customized 4-split view.

 

   

Figure 1. 4-channel view (operator-selected 4 sports channels)

 

In a recent test we conducted by using KT Giga Internet, Samsung's UHD TV and Kaonmedia's UHD STB , we found all 4 multicast streams are transmitted to STB in both cases - whether operator-selected or user-selected (see the screen shot of the traffic in Figure 2).

 

We also confirmed that both options allow for re-arrangement of the channels in the screen. So, a user can move channels around, for example, from the main window (seen in the left side of the figure below) to one of the 3 sub-windows (seen in the right side of the figure below), or the other way around.  

 

Table 1. Codec and streaming information measured in 4-channel view (of operator-selected 4 sports channels)

      Resolution Codec   Encoding rate Streaming rate Network BW   QoS
   Main window SPOTV 1920x1080 (Full HD) H.264 4:2:0   10.9 Mbps 11.2 Mbps CBR 0x80
   Sub window 1 SBS Sports 720x480 (SD) H.264 4:2:0 2.5Mbps 3.5 Mbps 3.6 Mbps CBR 0x80
   Sub window  2 KBS N Sports 720x480 (SD) H.264 4:2:0 2.5Mbps 3.5 Mbps 3.6 Mbps CBR 0x80
   Sub window  3 MBC Sports+ 720x480 (SD) H.264 4:2:0 2.5Mbps 3.5 Mbps 3.6 Mbps CBR 0x80

For 4-channel view, network bandwidth of 22Mbps (=11.2+3.6+3.6+3.6) is required.

 

 

Figure 2. Screen shot of traffic in 4-channel view (of operator-selected 4 sports channels)

 

The user-selected 4-channel view also had the same results as seen in Figure 2. KT's 4-channel view (operator or user-selected) allows all 4 channels to be independently transmitted in individual multicast streams. As a result, channels can be switched between the main and sub-windows, which makes KT's service different from others'.  

 

In summary, KT's 4-channel view service features 3 SD sub-windows (of 3.6 Mbps each, in 720x480) and one Full HD main window (of about 11Mbps, in 1920x1080). Viewing all 4 channels in UHD (3840x2160) is not technically possible, yet.

 

I personally was very satisfied with the quality of the service (both operator and user-selected options). Especially, watching 4 different news channels all at once with a peace of mind that I am not missing any news was a great experience.

 

What I liked about the service most was that I could watch just what I wanted without having to watch all the annoying advertisements. Apparently, this kind of service will change the way people watch TV from now on.

 

 

Thank you for visiting Netmanias! Please leave your comment if you have a question or suggestion.
 
 
 
 

[HFR Private 5G: my5G]

 

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