[opendtv] Re: tolerance Latency , Jitters & packet loss issues for MPEG-2 TS over IP netwo

  • From: Kon Wilms <kon@xxxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sun, 27 Feb 2005 09:45:16 -0800

On Sun, 2005-02-27 at 04:38 -0600, John McClenny wrote:
> As long as both sets of visual inputs are the same, I can't tell the
> difference sitting in my home.  The user has no way of knowing the
> total delay from TV ingest to display on their TV, just how
> out-of-sync the video/iTV experience is.  As long as they are in sync,
> how can I tell as the viewer?

ITV vs Video latencies has always been a problem when one tries to sync
the two - even with non-IPTV video. The solution for this is to either
A. measure the latency if it is constant, and build it into the ITV app,
or B. transmit OOB timestamping and offset against internal dynamic
buffer sizing, for the ITV app to be able to determine on the fly what
the 'video' time is vs. the lagged time is. You have to do this if the
ITV middleware has to dynamically pull carouseled data like bitmaps for
a football game anyways.

At least though with IPTV you can easily 'tune' to multiple ip feeds
without having the old inband chicken and outofband egg signal tuning
problem. :)

Cheers
Kon


 
 
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