Kdenlive 21.12.3 is 8 time slower !

Message

Ridrok · Post by **Ridrok** » Tue Apr 26, 2022 3:22 pm

Hello,

Since I updated I have kdenlive 21.12.3, I don't know which version I had before but probably just the previous one available.
The new version is very problematic when rendering. I use nvenc for rendering. Nvidia drivers did not change since and kernel did not change either.
Problem is that I used to render simple scenes in 4K 30 fps at 90 frame per second, and the video engine of the driver was 100%.
Now with this new version 21.12.3 of kdenlive, it render at 16 frames per seconds! And video engine is around 18% at max.

If one knows why this new kdenlive is so slow at rendering I would like to know before rolling back to 21.08.

Many thanks

Ridrok · Post by **Ridrok** » Wed Apr 27, 2022 11:20 am

Ok, then I will downgrade the full KDE and hope it helps.

Ridrok · Post by **Ridrok** » Tue May 03, 2022 8:29 am

I need help to downgrade, I did mask all the files named with both 'KDE' and '21.12' in their name, but nothing works. I revert to previous version 21.08 but everything is crashing. I am missing something like QT, but I don't remember what last update did install.

Code: Select all

qlist -I -v|grep kde|grep 21.12

Current version is unusable for me, I cannot even preview a 4k video in Kdenlive anymore even with intermediate clip, I need to activate movit and it crashes often. With 20.08 I could preview even without intermediate clip. And rendering with 21.12.3 is a nightmare, 8 times slower than 20.8.

Please help me get rid of this version 21.12.3 and revert back to 20.8, or I have no other choice to switch to another linux where I can select the version I want, my PC becomes useless with 21.12.3.

Ridrok · Post by **Ridrok** » Tue May 03, 2022 2:38 pm

I did build version 24.07.70 from source and it's a lot better, only 2 times slower than version 20.8, so 4 times faster than this poor 21.12.3!
Now that I know I can build another version without breaking KDE, I have hope to find the 20.8 sources and build it again. If I don't, version 24.07.70 is anyway far better.

You should really test this kind of big application part of KDE before releasing it and put people in trouble or give a way for going back.

Post by **asturm** » Wed May 04, 2022 8:26 am

You didn't consider filing a bug?

Ralphred · Post by **Ralphred** » Wed May 04, 2022 11:56 am

Problem is that I used to render simple scenes in 4K 30 fps at 90 frame per second, and the video engine of the driver was 100%.
Now with this new version 21.12.3 of kdenlive, it render at 16 frames per seconds! And video engine is around 18% at max.

It's a bit spurious to assume it's kdenlive doing that, kdenlive doesn't actually render anything, but passes it off to mlt.

Personally my projects still render at ~200fps, so I'd be more suspect of you drivers not being compatible with the newer mlt/ffmpeg versions.

Goverp · Post by **Goverp** » Wed May 04, 2022 4:06 pm

Ridrok wrote:...
You should really test this kind of big application part of KDE before releasing it and put people in trouble or give a way for going back.

No guarantees, but check the kdenlive people haven't changed something in the default project settings. My experience is that support for some things such as multi-threaded rendering have appeared and disappeared between releases; the latest version might still be capable of the same speed but some changed default setting prevents it.

Post by **asturm** » Wed May 04, 2022 7:38 pm

Ridrok wrote:I did build version 24.07.70 from source and it's a lot better, only 2 times slower than version 20.8, so 4 times faster than this poor 21.12.3!
Now that I know I can build another version without breaking KDE, I have hope to find the 20.8 sources and build it again. If I don't, version 24.07.70 is anyway far better.

You should really test this kind of big application part of KDE before releasing it and put people in trouble or give a way for going back.

Many things to unpack here, finally that I am sitting on a computer.

- First of all, if you find a bug in a software, file a bug report. Not in Gentoo, but with the makers of that software. That's where it comes from and without modifications.
- Testing in Gentoo, by the way, happens in ~arch. * That's the state in which software is before going stable, and if no one files bugs, we assume it is fine. **
- Don't assume *your* bugs are everyone else's bugs. *** [**] If you don't file them, they do not exist for maintainers and you have no chance of them being fixed.
- [***] Suggesting to test hundreds of packages at runtime to catch a bug that likely only happens on your very specific setup is quite ludicrous.
- [*] ~arch, by the way, provides a newer version of kdenlive you are free to test by unmasking the newer version, see here:

Code: Select all

$ eshowkw kdenlive
Keywords for kde-apps/kdenlive:
        |                               |   u   |  
        | a   a     p s   a   r   l     |   n   |  
        | m   r h   p p   l i i s o m m | e u s | r
        | d a m p p c a x p a s 3 o 6 i | a s l | e
        | 6 r 6 p p 6 r 8 h 6 c 9 n 8 p | p e o | p
        | 4 m 4 a c 4 c 6 a 4 v 0 g k s | i d t | o
--------+-------------------------------+-------+-------
21.12.3 | + o + o o ~ o + o o ~ o o o o | 8 o 5 | gentoo
22.04.0 | ~ o ~ o o ~ o ~ o o ~ o o o o | 8 o   | gentoo

- Furthermore, kde overlay provides stable branch and master branch versions of all KDE Gear packages at all times, so you have no excuse of having to build software on your own. See also:

Code: Select all

$ eshowkw -O kdenlive
Keywords for kde-apps/kdenlive:
              |                               |   u   |  
              | a   a     p s   a   r   l     |   n   |  
              | m   r h   p p   l i i s o m m | e u s | r
              | d a m p p c a x p a s 3 o 6 i | a s l | e
              | 6 r 6 p p 6 r 8 h 6 c 9 n 8 p | p e o | p
              | 4 m 4 a c 4 c 6 a 4 v 0 g k s | i d t | o
--------------+-------------------------------+-------+-------
22.04.49.9999 | o o o o o o o o o o o o o o o | 8 #   | kde   
         9999 | o o o o o o o o o o o o o o o | 8 o   | kde

- There is no such version 24.07.70. This is just a shim version upstream uses to denote git master.

Ridrok · Post by **Ridrok** » Mon May 16, 2022 11:30 am

I have pulled tag 21.08.2 from the git, compiled it and it suddenly was fast again.
I have open a bug report: https://bugs.kde.org/show_bug.cgi?id=453883

Rendering the same simple video project with 12 minutes of video 4k/30fps with 3 different versions:

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%

Latest live version 22.x is not any faster than 21.12.3 in simple project, it's faster than 21.13.3 in complex ones, but not as fast as 21.08.2.
Version 21.12.3 is slower and slower as the project becomes complex and difference between 21.08.2 and 21.13.3 is increasing far more.

Ridrok · Post by **Ridrok** » Tue May 17, 2022 4:27 pm

I am so happy to be back with version 21.08.2.
Back to something working, no need for preview to see the vidéo in kdenlive and proper fast rendering using the GPU fully.
Newer versions are crap.

Post by **asturm** » Tue May 17, 2022 5:53 pm

I think everyone got that by now.

FYI, 21.08.3 was the last version from 21.08 branch, not sure why you picked an older one.

Ridrok · Post by **Ridrok** » Wed May 18, 2022 6:03 am

asturm wrote:I think everyone got that by now.

FYI, 21.08.3 was the last version from 21.08 branch, not sure why you picked an older one.

I did not check which one was last version in 21.08 branch.
Thank you I will test 21.08.3 to be at least on latest version of the branch.