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Showing running time in output with key and fill

https://forum.blackmagicdesign.com/viewtopic.php?f=12&t=60759

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Showing running time in output with key and fill

PostPosted: Fri Jun 23, 2017 10:15 am
by fred_simon
Hi,

Im not sure on how to ask this but here goes.
Im doing a sport template and by using the IDeckLinkOutput::DisplayVideoFrameSync method and so far it is working.

Question is if I have a running timer, like those you would see in live running event, do I key and fill the output? Do I create an output for every millisecond and using the method DisplayVideoFrameSync? or by using streaming?

Re: Showing running time in output with key and fill

PostPosted: Wed Jul 12, 2017 3:44 am
by Nicholas Gill
Hi Fred,

I'd recommend looking at scheduled playback in order to generate frames for keying, see SDK manual section "2.4.8 Keying" for a high-level overview.

Your application would have to generate video frames with the current value of the timer drawn into the buffer at the rate appropriate for the active video mode.

I recommend against calling DisplayVideoFrameSync every millisecond, as even in p60 modes the minimum frame interval is 16.6ms.

Cheers,

-nick