Blackmagic Forum

When using a magic mask, depth map, or creating a mask using power windows in the Colour Page, connected to an Alpha Output, it all gets lost when returning to the Edit Page if you make any changes to the video on the timeline. That is, the clip is on the timeline, but not visible in the viewer at all.

I've repeated this several times. I have to return to the Colour Page, reset the node graph, make the changes again, return to the edit page, and... if I need to, say, scale or reposition the image using the Transform function in the Inspector, the image completely disappears.

Undo doesn't bring it back.

I can't duplicate this in Studio 20b1 for Windows.

Thanks Jim, it happens for me on Apple Silicone as well as iMac Pro with Xeon processor.


Sent from my iPhone using Tapatalk

Could be a mac issue. Or maybe an AMD GPU issue (I use nVidia).

More users will have to report in.

Can you post a screenshot or video of what you are doing on the edit page?

Yesterday: I updated the OS yesterday to Sequoia 15.4.1 and can no longer reproduce the error. I guess that's a good thing!

Today: It's happening again. I used the Depth Map on some clips, applied a blur to replicate DOF, when I opened the project this morning, the Depth Map wasn't working - everything was blurred. I replaced the Depth Map node and it just gave me black - no depth calculations.

I had other clips that I had used the Depth Map for transparency only - and these clips became invisible. In the colour page, the Depth Map nodes are not mapping any more - just completely black.

Still happening with the latest Beta released in the last day or two. I can't upload to the forum so I'll share a screen recording via a Google Drive.

https://drive.google.com/file/d/1-9FVPR ... sp=sharing

I hope this video helps you.

The alpha output on the Color page does not work for me in v20.0B Build 38 either.
It doesn't matter how I create the alpha - power window, magig mask, effects... the alpha output just doesn't work. I can't see the underlying clip.

Hello,

the alpha outputs for my updated project are sometimes not working after the update to 20

Davinci resolve 20 build 49

Nvidia 1070 ti

It is really strange, sometimes they do work, sometimes not. Have to restart resolve for that.