Re: webtv-ISSUE-21: Time synchronisation

I would think the actual relevant section in the second document to be 
2.5.9 Clocksync (within the theory of operations you point to in another 
email).
All examples point to a synchronisation in seconds. I can believe that 
this technology allows a synchronization with a precision of seconds.
We believe there is no way to achieve lip-sync (-20ms to +40ms) with 
such a mechanism based on UPnP 1.0, regardless of the media transport 
technology used.
Best regards
JC

On 6/6/11 10:47 , Russell Berkoff wrote:
>
> Hello,
>
> The submitted test case is redundant with facilities available in UPnP.
>
> UPnP AV-4 provides Linked Content Metadata (Object Linking) as well as 
> Precision Time Synchronization facilities. As previously mentioned in 
> this forum, the current UPnP specifications are now available at no 
> charge.
>
> Please refer to:
>
> http://www.upnp.org/specs/av/UPnP-av-ContentDirectory-v4-Service.pdf
>
> *Appendix G: Content Authoring with Object Linking*
>
> and
>
> http://www.upnp.org/specs/av/UPnP-av-AVTransport-v3-Service.pdf
>
> *2.4.25 SyncPlay()*
>
> Regards,
>
> Russell Berkoff
>


-- 
JC Dufourd
Directeur d'Etudes/Professor
Groupe Multimedia/Multimedia Group
Traitement du Signal et Images/Signal and Image Processing
Telecom ParisTech, 37-39 rue Dareau, 75014 Paris, France
Tel: +33145817733 - Mob: +33677843843 - Fax: +33145817144