https://bugs.kde.org/show_bug.cgi?id=512987
Bug ID: 512987
Summary: No Hardware Acceleration with Nvidia nvenc
Classification: Applications
Product: kdenlive
Version First 25.08.3
Reported In:
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Rendering & Export
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 187367
--> https://bugs.kde.org/attachment.cgi?id=187367&action=edit
screenshots
SUMMARY
When rendering a project, Kdenlive uses little CPU and no GPU. CPU load is
around 15%, and GPU load is 1-5%.
A test video with a duration of 1:25 is encoded at an average speed of 6
frames/sec. in 6 min. 57 sec.
When compiling the project, I tried using the following presets with hardware
acceleration:
1. NVENC H264 ABR (ab=160k acodec=aac channels=2 f=mp4 real_time=-1
threads=0 vb=6000k vcodec=h264_nvenc)
2. NVENC H265 ABR (ab=160k acodec=aac channels=2 f=mp4 real_time=-1
threads=0 vb=6000k vcodec=hevc_nvenc)
3. NVENC AV1 VBR (ab=160k acodec=aac channels=2 f=mp4 rc=constqp
real_time=-1 threads=0 vcodec=av1_nvenc vq=72 vqp=72)
But if I run the command:
ffmpeg -hwaccel cuda -i 194.mp4 -c:v h264_nvenc -vf "scale=2560:1440" -b:v 10M
output.mp4
The same test video is encoded in 11 seconds, with the GPU loaded at 100%.
STEPS TO REPRODUCE
1. Start rendering a project with nvenc preset
OBSERVED RESULT
Very slow rendering without hw acceleration on GPU
EXPECTED RESULT
Rendering with hw acceleration on GPU
SOFTWARE/OS VERSIONS
• openSUSE Tumbleweed 20251127
• KDE Plasma: 6.5.3
• KDE Frameworks: 6.20.0
• Qt: 6.10.1
• Kernel: 6.12.59-1-longterm (64-bit)
• Wayland
• CPU: AMD Ryzen 7 3700X 8-Core Processor
• RAM: 32 Gb
• GPU: NVIDIA GeForce RTX 5060 Ti 16Gb (driver 580.95.05)
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