[AG-TECH] VIC problems at 25fps

[Ivan R. Judson]

Would it be a simple work around for us to change the default behavior to
24fps in the next release so that this is at least avoided?

--Ivan 

> -----Original Message-----
> From: owner-ag-tech at mcs.anl.gov 
> [mailto:owner-ag-tech at mcs.anl.gov] On Behalf Of Christoph Willing
> Sent: Sunday, March 14, 2004 7:16 PM
> To: Steven
> Cc: AG-TECH; 'Michael Daw'; 'C.Cooper at compserv.gla.ac.uk'
> Subject: Re: [AG-TECH] VIC problems at 25fps
> 
> On Fri, 2004-03-12 at 21:54, Steven wrote:
> >  
> > 
> > Hello I have noticed a problem with vic on our machines here in the 
> > UK. The problem is manifested in two ways.
> > 
> >      1. The GUI for the vic window on the video machine is
> >         unresponsive, i.e. it is difficult to access GUI 
> buttons, etc
> >         and the window often doesn?t redraw correctly.
> [snip]
> > 
> > A quick fix is to set the 4 transmissions to 24 fps, but I 
> wonder if 
> > anyone else is suffering from the same problems or has any insights.
> > 
> > This obviously will only affect those using PAL sources, 
> though it may 
> > be interesting for someone with an NTSC or indeed SECAM source to 
> > comment when running at 25fps.
> > 
> 
> We've seen this here too for a long time. Our quick fix has 
> also been to restrict the frame rate to 24fps (PAL input).
> 
> Given the differing number of pixels in PAL & NTSC frames 
> (therefore the bandwidth for a particular frame rate), the 
> corresponding test on NTSC systems is whether they can do 
> 30fps (not 25fps, as suggested above).
> Looking at the ANL Lobby right now, all video streams (I presume NTSC
> sources) are running at 25fps, not 30fps. NTSC capture at 
> 25fps would be roughly equivalent to PAL capture at 20fps.
> 
> 
> chris
> 
> 
> 
> -- 
> Chris Willing                      Telephone   (61-2) 9351 3914
> Sydney Vislab, F09                      Fax    (61-2) 9351 5955 
> University of Sydney
> NSW 2006 Australia                http://www.vislab.usyd.edu.au
> 
>