- Posts: 4
- Joined: Wed Feb 16, 2022 12:38 pm
- Real Name: Pol Moro
Fri Feb 17, 2023 1:24 pm
Hi, I'm using a BlackMagic Decklink 4K Extreme 12G to output Fill & Key signals (SDI 8bit YUV single link 1080i50) in a live production context.
I'm using the BlackMagicMediaOutput plugin for Unreal 5.1 on a Windows 10 PC.
In my Unreal 5.1 project, I have a SceneCapture2D object rendering its view onto a RenderTarget (RTF RGBA8 +/-SRGB), captured by the BlackMagic plugin.
I'm previewing the outputs with a BlackMagic Decklink 4K Extreme (not 12G) on another Windows 10 PC running Media Express.
My problem is the Key signal is inverted: White pixels should be black and vice versa (see picture attached). By chance, there is a "Invert Key Output" option in the BlackMagicMediaOutput plugin. But for some reason, when it is checked, the Fill signal is wrong: It seems to be saturated and/or over contrasted.
I'm not sure what is going on here, or if I'm doing something wrong. I tried several Pixel formats as well as "Apply Linear to sRGB" option with no luck. My feeling is that the problem is in the plugin itself (or the driver?), not handling correctly the RGB channels when alpha is inverted.
Has someone experienced the same issue? Is there a workaround to have the right Fill AND the right Key signals at the same time?
I'm using the BlackMagicMediaOutput plugin for Unreal 5.1 on a Windows 10 PC.
In my Unreal 5.1 project, I have a SceneCapture2D object rendering its view onto a RenderTarget (RTF RGBA8 +/-SRGB), captured by the BlackMagic plugin.
I'm previewing the outputs with a BlackMagic Decklink 4K Extreme (not 12G) on another Windows 10 PC running Media Express.
My problem is the Key signal is inverted: White pixels should be black and vice versa (see picture attached). By chance, there is a "Invert Key Output" option in the BlackMagicMediaOutput plugin. But for some reason, when it is checked, the Fill signal is wrong: It seems to be saturated and/or over contrasted.
I'm not sure what is going on here, or if I'm doing something wrong. I tried several Pixel formats as well as "Apply Linear to sRGB" option with no luck. My feeling is that the problem is in the plugin itself (or the driver?), not handling correctly the RGB channels when alpha is inverted.
Has someone experienced the same issue? Is there a workaround to have the right Fill AND the right Key signals at the same time?
- Attachments
-
- Picture showing the BMD configuration and the Fill & Key output preview with and without Key inverted.
- BMDIssue.png (152.37 KiB) Viewed 1538 times