Merge doesn't work

Hi!

I've been working on a project and for a transition I wanted to merge to clips together in DaVinci Resolve 16 Fusion, but unfortunatelly, it won't work. I can't see the clip marked with the green line. If I swap the inputs the other one (also with green arrow) won't show. Therefore if I play my "MediaOut" it just shows the first clip and than it turns black.

Please comment if you know a solutions!

Best regards,
Panni

Not a hundred perfect sure about this. Would help if you posted your nodes here for inspection.

If I had to guess, I would say, make sure your video clips in the Edit page are selected and you create a compound Fusion clip. This should bring them both into Fusion page as Media In nodes. Then you should be able to merge one on top of the other. Also check the canvas size of each clip. Maybe one of the nodes is disabled? Control P to enable.

WHY is it so difficult to just drag in a video clip and trim it in a Fusion comp? WHY do I have to make a Background node to set a composition size? is there no way for a better implementation of this?

The first thing isn't difficult. The 2nd is only necessary if your footage isn't the size you want your comp to be. What would a better implementation entail for you?

If you add a media clip in to a Fusion comp, you should make sure the in point of the clip you brought in starts at the time code of the underlying Media In. Comping is about putting one thing on top of the other. If there's nothing underneath, then there's nothing to merge over. Putting down a basic background node ensures that you have actual picture to layer things over. Fusion in Resolve picks up the properties of the Media In clip that you created the comp on. If the clip has timecode that starts at frame 3000 then you have to make sure that any new footage that you drag into your comp from the Media Bin is available at frame 3000. Set the Frame In Hold to 3000 to bump the footage into place. Otherwise, you can move it in the Keyframe timeline.

If Resolve automatically bumped the footage to the first frame of the comp by default, it would be a quality of life feature that would help people out. Nobody would demand that they should have to manually set the in point.