https://bugs.kde.org/show_bug.cgi?id=394825
Bug ID: 394825
Summary: Slow render on Khadas Vim2 Max and NanoPC T3+
Octa-core 64-bit ARM
Product: kdenlive
Version: 17.12.3
Platform: Ubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: dekerfn...@hotmail.com
Target Milestone: ---
Hello.
For months I've been searching for a sollution on slow rendering with Kdenlive
on 2 octa-core 64-bit ARM cpu's.
Specs:
Khadas Vim2 Max : Amlogic S912 Octa-core big/LITTLE 4 x 1Ghz + 4 x 1.5Ghz. 3GB
ram
NanoPC T3+ : Samsung S5P6818 Octa-Core Cortex-A53 8 x 1.4Ghz
For my youtube channel I test all single board computers with the same project.
Some results Kdenlive 1080p 10minutes :
Khadas Vim2: 1h43m46s
NanoPC T3+ : 1h23m51s
Odroid C2 : 1h43m01s (4 cores at 1.75Ghz 64-bit)
Odroid XU4 : 1h12m43s (octa-core 4x1.4Ghz + 4x 2Ghz 32-bit)
Tinkerboard: 1h12m15s (4 cores at 1.8Ghz 32-bit)
As you can see, the Khadas Vim2 Max does it slower than the Odroid C2 wich only
has 4 cores. And also all the 32-bit cpu's do a lot better than 64-bit ones.
Compared to my BMW Blender render in 1080p
1h10m27s NanoPC T3+
1h12m43s Odroid XU4
1h18m55s Khadas Vim2
2h00m38s Odroid C2
2h29m42s Tinker Board
The results here are the opposite. 64-bit cpu's do a lot better, and the octa
core cpu's realy shine here.
In Blender all cores are always used to there max. In Kdenlive this is not so.
Certainly at the end it takes 37 minutes to finish the last 10%
I have tried with lesser threads on the NanoPC T3+, and the result was very
strange.
With 8 threads : 1h23m51s
With 6 threads : 1h24m29s
With 4 threads : 1h23m49s
With 2 threads : 1h41m64s
>From 8 to 4 threads it all looks the same. It doesn't use the cores to the max,
and certainly not when having to render transitions.
At 1 thread it only used 1 core at 100%
I have got a very long thread about this on the Khadas forum with many
screenshots of the behaviour and a lot more information.
http://forum.khadas.com/t/underwhelming-performance-khadas-vim2-max-in-video-rendering-kdenlive/1466/71
I hope you can help me fixing this. I use single board computers to do video
editing and rendering when traveling around Europe on my bicycle. I've always
used the Odroid C2 for this, but only in 720p.
So I want a better performing SBC to be able to render in 1080p.
If you want anything tested are more information, please contact me.
My email adres is dekerfn...@hotmail.com
Thank you in advance. Greetings
NicoD
P.S.: My youtube channel where I test these sbc's.
https://www.youtube.com/channel/UCpv7NFr0-9AB5xoklh3Snhg
--
You are receiving this mail because:
You are watching all bug changes.
