Bug 379441

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