https://bugs.kde.org/show_bug.cgi?id=502710
Bug ID: 502710
Summary: Windows: Kdenlive defaults to 2 rendering threads
regardless of CPU thread count Workaround Discovered:
Classification: Applications
Product: kdenlive
Version: 24.12.3
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Rendering & Export
Assignee: j...@kdenlive.org
Reporter: smokingwhe...@yahoo.com
Target Milestone: ---
Description:
On Windows, Kdenlive version 24.12.3 consistently defaults to 2 threads for
rendering in the environment settings, even on multi-core CPUs. The setting
appears not to save properly, and performance is limited until the issue is
resolved.
Steps to Reproduce:
1. Install Kdenlive on Windows (tested on Windows 11)
2. Open Settings → Configure Kdenlive → Environment
3. Observe the thread count is set to 2, regardless of hardware
4. Manually change it to a higher number (e.g. 15), save
5. Restart Kdenlive
6. Thread count resets to 2
Expected Result:
Thread count should default to a value based on detected CPU threads and remain
persistent between sessions.
Observed Result:
Thread count resets to 2 on every startup.
Workaround Discovered:
✅ Reinstall Kdenlive — after the second install, Kdenlive correctly detected
and defaulted to 15 threads (on a 16-thread CPU). This suggests the initial
config or hardware detection is faulty on first install.
System Info:
- OS: Windows 11 Pro
- Kdenlive Version: 24.12.3
- CPU: Xeon E5-2620 v4 (8 cores / 16 threads)
- RAM: 256 GB DDR4 ECC
- GPU: GTX 1050 Ti
Severity:
⚠️ Moderate — significantly impacts rendering performance on affected systems
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