Good morning, everyone .
I downloaded transitions in mp4 format from the internet.
These transitions have 2 colors: white and black.
I would like these colours to be replaced by images on both sides.
When I put a transition in the foreground, it displays black and white and when I put it under my video track you can't see anything.
Would you have a solution.
Thank you in advance.

You need to use the "Matte" composition

Thank you !

Hello, I've same problem, I use the matte transition with a mp4 transition from internet.
It's work fine in preview project monitor but when I render it doesn't work.

It doesn't render in KDE 19.12 than in the KDE 20.07.70 on win 10

do you have a link to this transition?

Hi and thanks, I did resolve after a crazy nigth of try.
YOU HAVE TO RENDER THE VIDEO IN THE SAME DIRECTORY WHERE THE *.KDENLIVE IS!!!!! if not the "matte" transition is NOT renderized! So strange!


The transition "MATTE" appplied on the .mp4 B/W clip



The mp4 video transition as show in the cliip monitor (clip of a brush that paint of withe the black background!)




How the result in the project window Clip B the lower is painted over the Clip A on the Top

HERE THE RESULT CHECK IT
https://youtu.be/H066dtsHrlQ

Hope you enjoy. MATTE is the STRONGEST instrument of kdenlive for me. Cause Wipe isn't so professional. MATTE instead let you to create any kind of transition you want!!!