[gmpi] Re: Reqs 3.9. Time - opening arguments.1

  • From: Paul Davis <paul@xxxxxxxxxxxxxxxxxxxxx>
  • To: gmpi@xxxxxxxxxxxxx
  • Date: Thu, 05 Feb 2004 15:37:29 -0500

>I would assume that when scheduling an event to sync with a video 
>display, the UST would represent the moment when the video frame 
>appears to the audience's eyes, not the realtime time when the video 
>or audio buffer was getting rendered, which is always earlier than 
>display time. If so, then all of this needs to take into account the 
>downstream audio output latency from the plug's place in the chain. 
>Including possible downstream graphs other than GMPI, the audio 
>output buffering, etc.  Nontrivial, as currently the GMPI sample 
>clock seems to be relative to the current GMPI graph only, with no 
>adjustment for what happend downstream.

yes, its highly non-trivial, but a host author has to deal with this
one way or another anyway, whether GMPI requires it or not.

--p


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