Extended Flameshot + fork with native MP4 recording, window snapping & 0x0.st upload

[Svarkovsky]

Hi everyone!

First off, huge thanks to all the maintainers and contributors for Flameshot. It has been my daily driver for years, and it is easily one of my favorite Linux utilities.

Still, I always found myself wishing for just a little bit of "extra dessert" on top - namely native video recording with sound, quick window snapping, and maybe a built-in radio (just kidding!).

So I spent some time tinkering and modernized a slightly older release (v12.1.0) tailored for my daily Linux workstation (Debian 12).

Here is what was implemented in this fork (Flameshot +):

• Native Video & Audio Recording: Record any selected screen region directly to MP4 (x264 + AAC) with perfect A/V sync via an external helper and a floating pre-record HUD (choose system audio, microphone, mix, or mute).
• Window Geometry Snapping (X11): Double-click any window (or press W / Tab) to automatically snap the selection frame to that exact application window.
• Default Modern WebP: Native WebP capture out of the box.
• Free Anonymous Uploads: Replaced the broken Imgur upload with a clean, anonymous 1-click upload to 0x0.st (with an automatic fallback to Catbox.moe).
• Debian Packaging & Testing: Built a Debian-compliant package (Provides/Conflicts/Replaces: flameshot), along with an automated test suite in CI (including virtual X11 GUI lifecycle tests under Xvfb and static analysis via cppcheck).

All changes are licensed under GPLv3, fully open-source, and tested:
https://github.com/Svarkovsky/flameshot-plus

I wanted to share this with the community and the core team. If any of these implementations, ideas, or architectural approaches look interesting to you, please feel free to borrow, cherry-pick, or adapt whatever you find useful into upstream Flameshot.

Thanks again for building such a great tool!