https://bugs.kde.org/show_bug.cgi?id=379441
Bug ID: 379441
Summary: git master - Movit Nvidia GPU rendering is SLOWER than
CPU rendering?
Product: kdenlive
Version: git-master
Platform: Ubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: jesse.dub...@gmail.com
Target Milestone: ---
I just tested movit and GPU rendering, which hasn't crashed since I enabled
it... which is awesome, but I came across something that's definitely a bug.
BEHAVIOR
Rendering a 90-second video edit with CPU took 3 minutes 30 seconds, while with
Movit GPU rendering enabled, it rendered in 5 minutes 40 seconds! WAY longer
than a GPU should be taking to render. I also have two Nvidia GTX 980ti's in my
system. I monitored the percentage each GPU was used during rendering, and the
2nd card wasn't used at all, while the 1st card showed only 17-24% utilization
of the GPU!
EXPECTED BEHAVIOR
Much like Blender, actually. Blender uses both Nvidia GPU's for rendering, and
Nvidia shows 100% utilization during each frame render; it cuts render time in
half, sometimes 3x as fast to use GPU's for rendering in Blender. I'd expect
GPU rendering (Nvidia or otherwise) in Kdenlive to be able to render with full
utilization of both (or at least one) GPU on my system.
BUG DISCOVERED USING
Kdenlive 17.07.70 via ppa:kdenlive/kdenlive-master
Movit package version 1.4.0-1
Ubuntu GNOME 17.04 x64
GNOME 3.24.0 desktop environment
Linux kernel 4.10.0-20-generic
2x Nvidia GTX 980ti graphics cards (SLI'd, though SLI isn't used in Ubuntu)
Nvidia 381.09 proprietary driver via ppa:graphics-drivers/ppa
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