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

  • From: John McClenny <jamcclenny@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 26 Feb 2005 07:03:15 -0600

On Sat, 26 Feb 2005 18:05:04 +0530, Prashant Desai
<prashant.desai@xxxxxxxxxx> wrote:
> Hello All
> 
>      Any one having an idea till what are the values for Latency,JITTER & 
> Packet Loss that can be tolerated without sacrificing the quality of the 
> MPEG-2 Video sent using MPEG-2 TS into UDP/IP.

Latency doesn't matter at all.  Jitter is taken care of by jitter
buffers in the STB and will not be problem with any well designed IP
network.  Jitter hasn't been a problem in any IPTV networrk I have
seen.

Packet loss is evil - any lost paclets show up either as lost video or
audio.  You can add FEC, but some SIP STBs are not going to have the
processing power to do FEC in software and there aren't any IP STBs
with hardware FEC support.  Some MPEG-4 system do really long time
jitter buffers and retry on lost multicast packets.

Your middleware vendor better have the answer to all of the questions
or you picked the wrong vendor...

Doc
 
 
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