Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Sat, 8 Mar 1997 06:07:51 +0000
Try setting the frame rate in the application process.
Also, check that the pfPhase is one which will sync to the
target rate, although this isn't your immediate problem.
Your other question was about definitions:
Video rate == field rate, frame rate must be some multiple of
the video rate. eg if video is 60 Hz this == 16.67milliseconds
per field so frame rate must draw at some multiple of 16.67 ms
eg 33.33 ms which would give a frame rate of 30 Hz or 50.00 ms
which would give a frame rate of 20 Hz.
The reason for this is that the graphics system must wait for a
video field boundary before it can change the rendered image being
sent to video to avoid apparent tearing of the image, so
you either make 16.7 ms or must wait 'til 33.33 ms and if you miss
33.33ms you must wait till 50.00 ms etc.
Cheers,Angus.
On Mar 7, 5:33pm, Ren-Jye Yu wrote:
> Subject: pfFrameRate not work ????
> Hello,
> I have a simple question. How to set the frame rate? I used pfFrameRate
> to set the frame rate but the frame rate didn't change to the value that I
> want. Do I miss anything? I use statistics diagram to check the target frame
> rate. The target frame rate is the default frame rate 72Hz.
>
> What are video rate and field rate ? How do they affect the frame rate
> ?
> Thanks. Have a nice weekend.
>
>
> --
>
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