[SOLVED] Poor quality for HD Keying with UltraStudio 4K

Hi,

I have a problem when using my UltraStudio 4K for external keying in HD 1080, with GdiKeyer example, but also with Blackmagic LiveKey. The image is perfect with HD 720, each pixel is displayed well, but if I use any of the HD 1080 modes, the quality is really poor. I made tests with a HD test pattern to see where the problem is. In fact, every columns (1920px) are well displayed, but only 1 row over 2 (1080px) is displayed and duplicated so alternate black and white lines are displayed totally black. I made a custom test pattern from the PM5644 as the original has only vertical stripes. The two "1" areas are supposed to be the same, one with vertical stripes and the other with horizontal stripes.Could anyone try this pattern with LiveKey and tell if it works?
Thanks a lot!

Bertrand

I use Desktop Video 10.8.1 and Desktop Video 10.8 SDK, with a MacBook Pro.

If using DisplayVideoFrameSync for video playback, disabling the "Remove Field Jitter On Pause" option will display both fields as expected / intended.

The solution is here:
https://forum.blackmagicdesign.com/viewtopic.php?f=12&t=47556
Next step is to find how to change this option from code

To change the "Remove Field Jitter On Pause" option, use bmdDeckLinkConfigFieldFlickerRemoval with IDeckLinkConfiguration interface. It would be better if BMD could use the same word in Desktop Video Setup (Jitter) and in the SDK (Flicker)