Bug 442197

Summary:	A particular set of ladspa plugins do not work at all
Product:	[Applications] kdenlive	Reporter:	Natalia Portillo <claunia>
Component:	Video Effects & Transitions	Assignee:	Massimo Stella <maxstar>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	claunia, julius.kuenzel, luzpaz
Priority:	NOR
Version First Reported In:	21.08.1
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Natalia Portillo 2021-09-08 22:43:54 UTC

SUMMARY
A particular set of ladspa plugins do not work at all.
https://lsp-plug.in/

The appear in the list, they're detected in command line output, but they don't work properly. Other LADSPA plugins work perfectly.

STEPS TO REPRODUCE
1. Add a new audio clip
2. Apply an LSP plugin
3. Set the parameters

OBSERVED RESULT
The audio clip is completely muted, the volume meters are 0, and no sound can be heard.

EXPECTED RESULT
The plugin filters the audio properly.

SOFTWARE/OS VERSIONS
ArchLinux rolling
Linux: 5.13.13-arch1-1
KDE Plasma Version: 5.22.5-1
KDE Frameworks Version: 21.08.1-1
Qt Version: 5.15.2+kde+r222-1

ADDITIONAL INFORMATION
SWH LADSPA plugins work properly.

Comment 1 Julius Künzel 2021-09-28 22:36:30 UTC

Thanks for your report! We are going to check this…

Comment 2 luzpaz 2026-01-26 19:58:05 UTC

(In reply to Julius Künzel from comment #1)
> Thanks for your report! We are going to check this…
Hi, what was the verdict for this? Thanks in advance.

Comment 3 Julius Künzel 2026-01-26 22:07:03 UTC

Thanks for checking! Testing and cleaning the effects is an ongoing efford and recently a lot has improved already. I'd say we can close this report as it is generic about ladspa plugins. Feel free to reopen or create a new report if you provide an actionable list with effects that work / don't work so we can fix this.