Black border around rendered 1080p footage from 4K (Resolve 9)

[Robino_J]

I get a 2 pixel black border on the top and left sides as well as a 1 pixel black border on the right and bottom sides when rendering 4K HD (3840x2160) footage to 1080p in Resolve 9 (version 9.0.3.009)

Output Blanking is set to 1.77, I can't find a way to turn it off. I also do not have any input sizing at all on the clip i am trying to render. I am rendering to ProRes 4444, 25p and my Red Raw settings are set to Full Res Premium.

Not sure what the issue is.

 

[Brad Allen]

Hi Robino,

I've noticed a similar thing too. Going from 4k down to 1080 in Resolve Lite, I've got some small black borders on the left and right hand side of my frame (probably 2 pixels wide on the left and 1 pixel wide on the right)

Also debayered at full premium.

Mine was rendered out as a Tiff sequence.

 

[Juan Melara]

Under options switch the anti-aliasing setting from auto to off. It seems fix it or at least minimise the black borders.

 

[Robino_J]

Thanks Juan it did minimize it but there's still a little weird border. It's more acceptable now. I wish there was a definitive fix to this bug.

 

[Juan Melara]

Have you tried turning off source blanking?

 

[Robino_J]

Have you tried turning off source blanking?

Where is the switch to disable source blanking? I see "override output scaling" in the image scaling options..