[Metal] With Metal as GPU backend activated playback in MovieClip editor is much slower than OpenGL #105606

New Issue

Helge Maus · 2023-03-09T16:16:12+01:00

Helge Maus commented

2023-03-09 16:16:12 +01:00

System Information
Operating system: macOS-13.2.1-x86_64-i386-64bit 64 Bits
Graphics card: Metal API AMD Radeon Pro 580 1.2

Blender Version
Broken: version: 3.5.0 Beta, branch: blender-v3.5-release, commit date: 2023-03-09 12:15, hash: dcfc9629c2f2
Worked: (newest version of Blender that worked as expected)

Short description of error
I have a regression here.
Loaded a EXR sequence (around 3GB Memory) in the MovieClip Editor for tracking.
When I have OpenGL activated as GPU backend, I get a playback speed of 30fps (realtime).
With Metal activated as GPU backend, it stutters around between 6-7fps.

Exact steps for others to reproduce the error
Start with VFX Template
Load an EXR sequence into the MovieClip Editor
Set "Scene Frames" and Framerate (30fps)
Prefetch
Press Play

**System Information** Operating system: macOS-13.2.1-x86_64-i386-64bit 64 Bits Graphics card: Metal API AMD Radeon Pro 580 1.2 **Blender Version** Broken: version: 3.5.0 Beta, branch: blender-v3.5-release, commit date: 2023-03-09 12:15, hash: `dcfc9629c2f2` Worked: (newest version of Blender that worked as expected) **Short description of error** I have a regression here. Loaded a EXR sequence (around 3GB Memory) in the MovieClip Editor for tracking. When I have OpenGL activated as GPU backend, I get a playback speed of 30fps (realtime). With Metal activated as GPU backend, it stutters around between 6-7fps. **Exact steps for others to reproduce the error** Start with VFX Template Load an EXR sequence into the MovieClip Editor Set "Scene Frames" and Framerate (30fps) Prefetch Press Play

system-info.txt

7.0 KiB

Bildschirmfoto 2023-03-09 um 16.11.41.png

2.9 MiB

Helge Maus added the

labels 2023-03-09 16:16:13 +01:00

Helge Maus commented

2023-03-09 16:35:37 +01:00

An addition to that:
I have the feeling, that the whole MovieClip Editor display is much slower that with OpenGL or in 3.4.1 . Paning the view around is one example ... Seems to be a problem with the viewer itself ...

An addition to that: I have the feeling, that the whole MovieClip Editor display is much slower that with OpenGL or in 3.4.1 . Paning the view around is one example ... Seems to be a problem with the viewer itself ...

Helge Maus changed title from ~~[Metal] With Metal as GPU backend activated playback im MovieClip editor is slower than OpenGL~~ to [Metal] With Metal as GPU backend activated playback in MovieClip editor is much slower than OpenGL

2023-03-11 13:43:37 +01:00

Michael Parkin-White commented

2023-03-11 14:16:43 +01:00

I can have a look into this, perhaps hitting a slow path with AMD-based GPUs as a few of the texture update paths are optimized for Unified-memory-architecture in Metal, but this could result in slower flushes on discrete memory systems, which could explain slow video playback.