Hi guys!
I was using Kdenlive for making socialmedia vertical videos (tiktok/reels) on Debian 10 and everything always worked fine.

But on Linux Pop Os 21.10 with Kdenlive Version 21.12.3

When I start new project with my custom settings:
Frame size: 720 x 1280 (9:16)
Frame rate: 25 fps
Pixel Aspect Ratio: 1
Color Space: ITU-R 709
Interlaced: no

I add a video to my project bin it looks ok:


But when I add a TRANSFORM effect to my video it also adds those black stripes:


I don't know how to turn them off.

It never happened when I was using Kdenlive version 18.12.3 on Linux Debian 10.

Do you have any idea how to fix it?

Bests
Adam

can you provide a very small clip example with this format? i will do some tests.

I create the exactly same profile and have no issues. (Linux Mint & Arch)
I really don't know how to solve it but what happen if you enable the "distort" checkbox?