Background going Black when Crossfading

In my main timeline, I have a compound clip with two separate clips inside, crossfading between them. These two clips are PNG images with a transparent background. When viewing in the main timeline (and in the export) the background during the crossfade turns black, and then back to transparent when the crossfade finishes. It's very strange, and I haven't found a great workaround.

See 0:48 of this video: https://vimeo.com/346749499/e8d0bc2bdc

Thoughts?

Seeing the same behavior with a compound cross-fading between to exr images. DaVinci Resolve 17.1.1.

this has been a long standing bug. we also get issues with nested timelines with alpha channels.

rather big bug.

I'm also seeing this in Studio 17.1.1 for Windows.

The alpha goes weird once the clips are Compounded.

Any updates or workarounds for this? I have the same issue with 2 clips with crossfade in a compound clip then the whole timeline goes black during the crossfade. I'm on the latest version of Resolve.

You may have to skip the Compound part.

You may have to skip the Compound part.

That's a shame then. Are we not supposed to be able to use transitions within compound clips?

I would consider this a bug. Skipping the Compound is a temporary work around.

Being hit by the same problem: cross-dissolve transitions between text+ clips in compound clip break alpha, the text background go black during the transition.

Really bad stuff... and I understand it's been there since 2018 at least.

Please fix it, this is very annoying and it's been here for far too long.

Thanks,
Mario

Use Fusion transitions in the Effects Library, as they support alpha channel processing. Most other Resolve transitions don't process alpha channels.

Use Fusion transitions in the Effects Library, as they support alpha channel processing. Most other Resolve transitions don't process alpha channels.

My clips are in the edit page and not in Fusion... can I use Fusion transitions in the edit page?

EDIT: YES IT WORKS with Fusion Cross Dissolve, THANKS!

BTW, compound clips are supposed to be exactly the same as in the main timeline, is it wrong to assume that if some clips crossfade correctly in the main timeline they should do the same when in a compound clip? At the moment I would classify that as a bug.

Thank you for replying!

- Mario

My clips are in the edit page and not in Fusion... can I use Fusion transitions in the edit page?

Yes. That's their purpose: to be used on Edit. Behind the scenes they use Fusion to do the transition, but they're solely designed for use on Edit (and Cut I guess.)

These are the stock Fusion Transitions:


It's also possible to make your own, or download/buy them from third parties.

Unlike non-Fusion transitions, Fusion Transitions can be edited by clicking the little Fusion icon that appears in the Edit page Inspector when the transition is selected. That takes you to the Fusion page where you can adjust the nodes any way you like. So they're quite a bit more flexible and powerful than the older non-Fusion transitions

Also, compound clips are supposed to be exactly the same as in the main timeline, is it wrong to assume that if some clips cross fade correctly in the main timeline they should do the same when in a compound clip? At the moment I would classify that as a bug.

It's probably more a limitation or missing feature rather than a specific bug, but yes it's annoying and confusing.

There are a number of limitations with nested containers in Resolve at this time. They should act exactly like a media clip, allowing all the same features and capabilities and operating seamlessly from a user perspective. But unfortunately in several respects they currently do not.

These issues have been raised for years, so BMD are definitely aware.

At least now in v17 the transition transparency issue can be avoided by use of Fusion Transitions. So that is a definite improvement on past versions. Maybe BMD even plan to deprecate the non-Fusion transitions eventually. That's possible.

Thank you again.

P.S. I see your audio card, it works well right? I have it too, I think it's cool but it's only there as a backup for when my Fireface UC goes down...

- Mario

You may have to skip the Compound part.

Even on 17.4.6 the alpha is gone on compounds. I hope they will solve in 18

Seems to be working in 18 b3.