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

  • From: Prashant Desai <prashant.desai@xxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 26 Feb 2005 18:42:11 +0530

John

   have not yet picked the vendors so wanted to understand so that can
minimize the mistakes while picking up the one ........ btw , typically
what i would like to understand is  till what  value of jitter can be
tolarated in case of MPEG-2 TS into UDP/IP  .........what are factors that
can be considered within an  IP STB  to enable the IP STB to support  high
amount of jitters ...........typically what are the values of  jitters that
the existing IP STBs  [ from amino , pace , kreatel ] etc will be able to
tolerate without sacrifysing the video quality ...................  & ya as
you have stated why  latency doesnt matters ?  i think it does matter
............
and one more thnig  how the middleware comes in to this or effects this ?
its an issue related to encoders and video servers  but not the middeware
.................correct me if i have missed out anyting .....pls do so


regards,
Prashant


----- Original Message ----- 
From: "John McClenny" <jamcclenny@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Saturday, February 26, 2005 6:33 PM
Subject: [opendtv] Re: tolerance Latency , Jitters & packet loss issues for
MPEG-2 TS over IP netwo


> 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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