https://bugs.kde.org/show_bug.cgi?id=453883
Bug ID: 453883
Summary: Version 21.12.3 and above are 4 times slower than
21.08.2 in rendering
Product: kdenlive
Version: 21.12.3
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: stephane.plant...@free.fr
Target Milestone: ---
SUMMARY
Rendering has become very slow with version 21.12.3 compared to previous
version that came with gentoo : 21.08.2
MLT is version 7.4.0
I use kdenlive for 3 years and it's the first time I see that drastic slowdown,
I had to build 21.08.2 again to be able to use it. Whatever the video is simple
(no filter or anything) or complex (multiple video and audio tracks,
transformation...) the speed in rendering difference between 21.08.2 and
21.12.3 or any newer version is huge.
To be sure, I did build the 3 version in same system with no changes in any
other components.
STEPS TO REPRODUCE
1. Set up a rendering with these parameters: f=mp4 movflags=+faststart
vcodec=hevc_nvenc vb=24000k acodec=aac ab=160k real_time=-14
2. Render a 4k/30fps video
3. record the time it took
OBSERVED RESULT
Video is 12 minutes long 4k/30fps, nothing special applied on it except some
volume parameters.
Rendering, with same MLT, same everything except the kdenlive version.
Version 21.08.2: 3"45 (225 secs), Video engine usage: around 85% max 93%
Version 21.12.3: 11"54 (714 secs), Video engine usage: around 30% max 33%
Version 22.07.70 (live git): 11"52 (712 secs), Video engine usage: around 30%
max 37%
EXPECTED RESULT
Same rendering performance has 21.08.2 and older versions, not 4 times slower.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Gentoo Linux x64
(available in About System)
KDE Plasma Version: 5.23.5
KDE Frameworks Version: 5.92.0
Qt Version: 5.13.3
ADDITIONAL INFORMATION
I use a Ryzen 7 3700X with 64GB DDR4-3600 Memory and nVidia GTX 1070-TI and
nvenc encoder
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