delay times transmission SD to HD

nidi

Active Member
Hello guys,

I'm watching the England vs. US soccer match right now here in Switzerland

on ITV HD over Satellite , Swiss SD public broadcaster over Satellite
and Swiss public broadcaster over our analogue cable system.

I discovered that the ITV HD satellite transmission is 6 (yes six seconds)
BEHIND our cable service , and ITV1 London is 3 seconds behind.

how can you label that as a LIVE transmission ?

Michael
 

PK - the king

Novice Member
SD MPEG-2 will be about 3-5 seconds behind live feed.
HD MPEG-4 will be aboue 3-5 seconds behind "live" SD digital (so as much as 10 seconds behind live).

The delay is down to the techniques used by MPEG-2 and MPEG-4 to squeeze the video and audio date into a small bitrate, whilst maintaining perceived quality.
 

JH4

Well-known Member
..and you can't go faster than the speed of light to the Satellite and back...
(Unless you are Doctor Who.. )
:D
 
Last edited:

AndyCob

Well-known Member
That's actually pretty good for a satelite relayed HD signal, besides even your eyes aren't live, divide distance to players by speed of light and allow for neural processing time in the optical cortex of the brain:devil:, don't even get me started on the whole what you think you see isn't even actually what's there but what your brain creates from the impulses received down your optic nerves.:rolleyes:
 
Last edited:

simon194

Well-known Member
..and you can't go faster than the speed of light to the Satellite and back...
:D
... and it's probably done two hops via satellite from SA before it reaches the downlink in the UK.
 

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