https://bugs.kde.org/show_bug.cgi?id=479684
Bug ID: 479684
Summary: Timeline unbearably slow (2+min per click) + vast
Memory Leak
Classification: Applications
Product: kdenlive
Version: 23.08.4
Platform: Neon
OS: Linux
Status: REPORTED
Severity: grave
Priority: NOR
Component: User Interface
Assignee: j...@kdenlive.org
Reporter: mauritiu...@web.de
Target Milestone: ---
SUMMARY
neofetch:
OS: KDE neon 5.27 x86_64 Kernel: 6.2.0-39-generic Shell: bash 5.1.16
Resolution: 1920x1080, 1920x1080 DE: Plasma 5.27.10 CPU: AMD Ryzen 5 3600
(12) @ 3.950GHz GPU: NVIDIA GeForce GTX 1660 Ti Memory: 18739MiB / 31994MiB
Kdenlive: 23.08.4
Summary:
Kdenlive's timeline / entire UI becomes impossible to use for large projects.
Performance decreasers & possible causes:
Possible reasons for my particular project are:
- no loop function / mass clip group copy-pasted nodes
- mp3 files cannot be proxied / mass mp3 amount in project bin
- project contains 6 sequences of roughly 40min edited footage each, 1 extra
main sequence that imports these sequences and adds background music using mp3s
Performance increasers:
I am barely using animations / transitions, FYI. Further, I have proxied pretty
much everything in the entire project. Additionally, I have made sure to try
and optimize Kdenlive settings for performance, i.e. disabling thumbnails for
90% of my editing process, modifying clips externally, disabling detrimental
experimental features like GPU processing, disabling timeline autoscrolling,
etc.
My workflow before the escalation:
When I say it becomes impossible to use I mean I have been editing more or less
blindly ever since getting to hour 1 of my multiple hour long footage. I.e. I
literally memorize the steps I am performing and perform them blindly while the
UI needs usually around 30sec to 1min to catch up.
Why I made this report:
Issue #1
I have now gotten to the point where I am done editing ~5hrs of footage and
would like to put it all together in a main sequence and overlay some music.
You can image how long of a tedious journey I have come due to UI lagging and
occasional crashes, occasional malfunctioning of the video preview etc.
Precisely with the addition of a third song though Kdenlive has turned
unusable. It now takes FROM A MINIMUM OF 2 UP TO 5 MINUTES to do anything at
all. That includes simply clicking on a clip and loading it. Clicking on e.g. a
mp3 to open context menu. Adding a keyframe to a loaded clip. Scrolling.
Zooming. Clicking on any part of the UI, e.g. Help-menu.
My RAM usage is around 50-70% of 32GiB.
Issue #2
Now for the very fun part:
When I have the video preview running while doing anything else really, e.g.
adding a keyframe, clicking on a clip to look at properties, trying to change
master volume etc., Kdenlive hangs up entirely, does not ever stop playing the
preview and RISES IN RAM USE BY 4-8% PER SECOND UNTIL THE ENTIRE SYSTEM
CRASHES. I have been working on 99.7% RAM use for days and at this point I can
never even look at the preview. So now I am quite literally blindly editing.
Please fix, I love Kden and I'd hate to choose another editor because of all
this.
STEPS TO REPRODUCE
1. Make large Kdenlive project, length > 1hr
2. Let the preview run
3. Tab out / keep editing while the preview is running
4. Attempt stopping the preview by e.g. clicking on a timeline guide
OBSERVED RESULT
UI becomes hardly or entirely unnavigable (1-4hr project has up to 1min loading
times per click, e.g. for adding a keyframe, project lengths above have up to 5
min of loading time, lowest being aounrd 2min).
Memory rises continuously until it reaches 100% cap.
App freezes completely. Becomes hardly or entirely unnavigable & unresponsive
during the entire process (depending on project size).
EXPECTED RESULT
UI should continue to function at project sizes > 1hr.
RAM shouldnt be leaking uncontrollably.
RAM shouldnt be leaking just because the preview is playing. This works on
pretty much all project sizes I have tried.
The preview should stop after a certain threshold to prevent this.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE neon 5.27
KDE Plasma Version: Plasma 5.27.10
ADDITIONAL INFORMATION
https://www.reddit.com/r/kdenlive/comments/194qbs6/timeline_unbearably_slow_2min_per_click_vast/
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