[Live-devel] about ts server trickmode(PMT_PID not same)

[zhang shawn]

  Thx,i got it.
  
  i don't know media server much, I want to know,when trickmode, whether 
most servers use this method like live server,including commercial's?Just 
interest --:)

>From: Ross Finlayson <finlayson at live555.com>
>Reply-To: LIVE555 Streaming Media - development & 
use<live-devel at ns.live555.com>
>To: LIVE555 Streaming Media - development & use 	
<live-devel at ns.live555.com>
>Subject: Re: [Live-devel] about ts server trickmode(PMT_PID not same)
>Date: Wed, 24 Jan 2007 17:19:08 -0800
>
> >hi,
> >    I test my STB trickmode performance with live555 media server.
> >    And I find that,when trickmode(server create a .tsx file with
> >MPEG2TransportStreamIndexer),server send a PAT section which's PMT_PID 
is
> >different from the original PAT'PMT_PID.I read code,maybe it's a default
> >value--0X10.
> >    So,if my client just parse PAT once,it will save the original 
PMT_PID
> >form the first PAT,it will not parse the trickmode PAT,so will not 
continue
> >play out.
>
>You should fix your client to parse the PAT, whenever it appears.  As
>far as I know, it is perfectly legal for the PMT_PID to change within
>a Transport Stream, as long as this change is noted in a PAT.
>
> >    I don't know,why don't server get the original TS file's PMT_PID, 
and
> >reuse it in trickmode?
>
>This would require a change to the index file format, and is not
>something that we plan to do.
>
> >Because many cases,we have only one programes in
> >ts'file.
>
>As I noted above, it is legal for the PMT_PID to change within a
>stream.  (Even if our server were modified not to do this, then other
>servers might still do it.  So your client should check for it
>regardless...)
>--
>
>Ross Finlayson
>Live Networks, Inc.
>http://www.live555.com/
>_______________________________________________
>live-devel mailing list
>live-devel at lists.live555.com
>http://lists.live555.com/mailman/listinfo/live-devel

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