Hi,
I worked on a movie of 52min and now it's time to render. He is in 4K 60fps and when I make a render (h264) that took 7h the first time.
Now, I add fisheye correction and that took 18h to render. CPU is not use to 100%. I have an I9-9900K so I think that can be faster.
I use appimage 19.08.0a on Ubuntu 18.04.3
Do you have any idea ?

Render performance issue is known. Try with the Appimage 19.08.1 and try to set encoder speed on Ultrafast. Update to Ubuntu 19.04 could solve some package issue as well.

Thanks,
I just download the new appimage. I will try soon.
I plan to update Ubuntu soon too.

Thanks,
I just download the new appimage. I will try soon.
I plan to update Ubuntu soon too.

Salut Julien

I also was annoyed by very long render time, I mixed several things (not very scientific) and got better results:

- my laptop power supply was not properly recognized, and CPU switched to powersave mode dividing frequency by 4! check you are not in similar situation (KDE system monitor widget can popup the info), if so the workaround was adding 'processor.ignore_ppc=1' to kernel boot options
- I switched tracks composition from "high quality" to "preview" (left "settings" icon in timeline toolbar)
- I used webm render format instead of mp4, and checking "more options", I pushed the "encoder speed" to maximum (no matter if the file is slightly bigger), and set encoder process number to number of cores -1 (7 for my 8 cores i7)

I will further test later, but if you want to try these steps on your side (1 by 1?) and gives feedback... I hope this can help!

Cheers,

Vincent

Hi,
Yesterday I launch the render for a part of 4min of this movie. 1h39 to do it
I just upgrade ubuntu to 19.04 and now I launch for the entire movie.
I am not on a laptop. I set 15 cores but I leave mp4. Answer in few minutes
If I let "preview" for the tracks, maybe the final quality is not the same ?

MP4 or VP9 is the same thing, kdenlive announce arround 21h to render 52min...
Last time the final file was 56go...
I think there is a problem.

Render was just finish after 16h...
I miss one thing si I need to do it again...
For try, I select "preview" for the timeline and render with proxy clip. Kdenlive announce 14h.
I don't understand why on this project it's so long. And, like I say, the final fil was 56go. Before, for the same project, I have a 8go file in 7h (very long render work too).

The last render was 83go with fast preset.
I need to make one more now because I made some modification to the movie. I'm going to be crazy.

"Preview" quality is not so bad, difference hardly visible in most cases: test if faster on just a small zone...

Recently my export was faster with webm vp8, max speed.

You can also try lossless export (ffv1 or so), big file, but fast to encode, and once you checked there is no mistake just transcode to h265 with ffmpeg!

But sure 4k@60fps is hard on processing & encoding!

To get more reactive interaction, join #kdenlive on Telegram or IRC (freenode) (matrix not bridged at the moment...)

I try in lossless few days ago and that announced arround 20h too.
Today I make a 14min video in 1080p@25 and that take 38min to make the render.
I set 15 cores but CPU is just used to 15%/20%.

I launch a render in lossless ffv1 and it's very long too.
You can look this picture http://zupimages.net/viewer.php?id=19/37/u6qt.jpg

vpinon wrote:You can also try lossless export (ffv1 or so), big file, but fast to encode, and once you checked there is no mistake just transcode to h265 with ffmpeg!

I'm interested - could you explain this a bit more?
What is lossless export - is it truly lossless?
Also, why is it faster to encode?
Then why are you transcoding to h265 with ffmpeg - what does this achieve and allow?
And is that done in KDEN or something else like Shutter Encoder?