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ScheduleVideoFrame() SDK question

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Kyle Granger
ScheduleVideoFrame() SDK question
on Jul 23, 2010 at 2:36:24 pm

So... a couple general questions about how ScheduleVideoFrame() works...

1) Are frames sent synchronously to the DeckLink, and buffered there? Or is there rather no buffering, or maybe just front/back buffering, with the additionally queued frames sent when the front/back flip happens?

2) I schedule frames, say, and times 0, 1001, 2002, etc. (vanilla 1080/59.94i). Does StartScheduledPlayback() start the clock running when it gets called, at the given time? e.g.,
a) schedule first 3 frames at 0, 1001, and 2002.
b) call StartScheduledPlayback(0,30000,1.0f)

This would be a reasonable way to start up buffered output to the DeckLink?

By the way, I like the SDK, and I find the SDK PDF doc super.

Thanks again!

Kyle Granger

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Daniel Moore
ScheduleVideoFrame() SDK question
on Jul 23, 2010 at 6:54:55 pm

Hi Kyle,

your best bet for SDK related questions is to contact Blackmagic Developer Support

They can answer your questions & sign you up to the developer email list, if
you're interested.

Glad to hear you're finding the SDK a pleasant experience to use!


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Kyle Granger
Re: ScheduleVideoFrame() SDK question
on Jul 24, 2010 at 3:07:49 pm

Hi Daniel,

Yeah, you're probably right. Thanks for the heads up.

greetings from Vienna,


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