nanog mailing list archives

Re: 60ms cross continent


From: Mark Tinka <mark.tinka () seacom com>
Date: Thu, 9 Jul 2020 18:47:35 +0200



On 9/Jul/20 18:00, Christopher Munz-Michielin wrote:
 
I'd assume it's a question of available bandwidth and availability of
decoders.  From my observations most HD satellite feeds seem to sit
between 3 and 5 mbps, a typical Ku band transponder might have a
bandwidth of around 20-25mbps.  This means you can cram 5-8 HD feeds
onto a single transponder.  With 4K streams the bandwidth requirements
double, meaning you can cram a lot less in the same amount of
transponder space and satellite bandwidth is expensive!

The other issue is on the decoder side.  Right now, the vast majority
of satellite subscribers receive programming though dedicated decoders
(set top boxes).  Most of these decoders only have hardware to decode
MPEG2 and H.264 video, while 4K stuff is almost exclusively H.265.  
That means it's not a simple matter of turning on 4K, you'd have to
arrange to send new decoders to all your subscribers wanting to
receive 4K.

As time moves along, I'm sure we'll start to see more satellite feeds
available in 4K but like the transition to HD video, it'll be a slow
process.

The above are all the reasons I've been positing as well.

It's just that with more and more stuff being loaded on to IP (not to
mention, good ol' IPTV), does it make sense for broadcasters to upgrade
satellite infrastructure and decoders to support 1080p, 4K, 8K, 16K,
e.t.c., when all you need is an app and an Internet connection for the
very same (if not better) quality?

Not to mention, considerations for eyeball time in the fight between the
linear TV and VoD?

Mark.


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