Can’t record screen on Plasma when using Snap

sblantipodi · May 6, 2026, 9:01am

Hi, I hope someone can help me. The same snap that runs on Ubuntu 25 does not run on Ubuntu 26.

the app is a screen recorder that uses GStreamer + pipewire X11 + dbus portal

Do you see anything obvious that could prevent it from working on Ubuntu 26?

snapcraft/snap/snapcraft.yaml

c47d5f0e1

name: fireflyluciferin
title: Firefly Luciferin
base: core24
version: '2.17.21'
summary: Ambient lighting software
description: |
  Ambient Lighting or Bias Light is a technology that enhances your viewing experience by projecting colored lights onto the wall behind
  your TV/Monitor, matching the colors on the screen. This creates a more immersive and engaging atmosphere, making your favorite shows,
  movies, and games feel even more captivating.

website: https://github.com/sblantipodi/firefly_luciferin
contact: https://github.com/sblantipodi/firefly_luciferin/issues
issues: https://github.com/sblantipodi/firefly_luciferin/issues
source-code: https://github.com/sblantipodi/firefly_luciferin
icon: fireflyluciferin.png
license: GPL-3.0

grade: stable
confinement: strict
platforms:

This file has been truncated. show original

The issue happens with KDE 6.4.4 — it works fine on GNOME. It seems that GStreamer is not able to capture the screen on KDE, while it works on GNOME.

I’m using GStreamer and PipeWire to capture the screen, and I need to open a portal on D-Bus to do it. However, this worked correctly on Ubuntu 24–25 on both GNOME and KDE. On Ubuntu 26 it works on GNOME but not on KDE.

If I run the app natively outside of snap, it also works fine on KDE on Ubuntu 26.

This is the app

sblantipodi · May 6, 2026, 7:34pm

Issue founded.

Kwin changed the maximum buffer size from 1 to 16

to 1 to 4.

https://invent.kde.org/plasma/kwin/-/merge_requests/5502

adjusting the buffer size on my gstreamer pipeline fixed my issue.