Decklink SDK Internal Keying not sharp Interlaced

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Alexander Berger

  • Posts: 2
  • Joined: Sat Jun 17, 2017 7:32 pm

Decklink SDK Internal Keying not sharp Interlaced

PostSat Jun 17, 2017 7:41 pm

Hi!

I am using the Decklink SDK and it's internal keying feature. The performance is great and it works stable.

I am using 1080i50]als input mode and provide an image to be keyed with 1920x1080. But it is seems only one half of the image is scanned out and keyed by Deckling, as fonts and edges are not sharp. When using 1080p50 everything looks as expected.

Now do I have to supply something different to the DisplayVideoFrameSync method? When outputting the same keyed image on my regular render machines/software all the edges look good.

Thanks for your help!
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Dave Johnstone

  • Posts: 172
  • Joined: Mon Dec 08, 2014 11:12 am
  • Location: Adelaide

Re: Decklink SDK Internal Keying not sharp Interlaced

PostThu Jul 06, 2017 3:53 am

I am not seeing any interlacing issues on my system (HD Extreme 3D) keying OpenGL over 1080i/50 video, have you looked at the "Remove Field Jitter" setting in DesktopVideo or in the SDK? I have read topics regarding this and vertical resolution in the past here:
viewtopic.php?f=12&t=47556
and
viewtopic.php?f=12&t=49994

Regards,

Dave.
Freelance Television Broadcast Engineer
and Software Programmer.
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Alexander Berger

  • Posts: 2
  • Joined: Sat Jun 17, 2017 7:32 pm

Re: Decklink SDK Internal Keying not sharp Interlaced

PostThu Jul 06, 2017 9:45 am

Thanks! It works.

So when using DisplayVideoFrameSync() one needs to make sure that "Remove Jitter Field" is OFF.

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