I got a demo of a national network quality (and price) digital TV
encoder from a ham friend in the industry.
It took about 6 seconds delay itself to encode images. The compression
has a lot of state and multiple heuristic systems as well (face
trackers, for example).
Leigh/WA5ZNU
On 01/01/2012 09:09 PM, David I. Emery wrote:
On Sun, Jan 01, 2012 at 05:54:46PM -0800, J. Forster wrote:
To me the ball drop/fireworks was different from the on-screen time on FOX
by a few secnds.
I was watching the media pool HD satellite feed on AMC-1 and
through a broadcast grade IRD (ex PBS Bitlink ) it appeared to be about
2 seconds slow relative to my house NTP timing. This would about
exactly match what I would expect for uplink encoder, satellite path,
and decoder delays.
I would expect a TV station using that feed might add anywhere
from 1-6 seconds to the delay in their internal processing to OTA... and
a digital cable system might add further delay to that (couple of more
seconds at least).
Real time TV these days is only RELATIVELY real time.
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