https://bugs.kde.org/show_bug.cgi?id=510047
Bug ID: 510047
Summary: Wrong LADSPA control indexes when plugin exposes audio
ports before control ports
Classification: Applications
Product: kdenlive
Version First 25.08.1
Reported In:
Platform: Debian stable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Audio Effects & Transitions
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
I had problems with several LADSPA plugins. Some seem to work, some don't. I
dug a little deeper with the DeepFilterNet plugin:
https://github.com/jacksongoode/DeepFilterNet
When changing control values in the Kdenlive UI, the DeepFilterNet plugin gets
sent the wrong control indexes. The index is always off by 4, which I verified
with a log statement in the plugin code. The DeepFilterNet plugin exposes 4
audio ports (stereo in, stereo out; index 0 to 3) and several control ports.
The DeepFilterNet plugin works in Audacity. Other plugins, such als Rubber Band
Stereo Pitch Shifter, work also in Kdenlive.
Rubber Band Stereo Pitch Shifter and other LADSPA plugins export control ports
first, then audio ports.
Kdenlive seems to confuse the port indexes when plugins expose audio ports
before control ports.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 12
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.0-39-amd64 (64-bit)
Graphics Platform: offscreen
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 47.0 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3060/PCIe/SSE2
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