Presets in Kdenlive

Help
1

I have added a custom preset to the UHD section of
the Render section … Am experiencing a problem and just can’t solve it.
Here is the string I want to enter in the preset:
acodec=aac channels=2 crf=18 f=mp4 g=15 pix_fmt=yuv420p preset=slow progressive=1 r=29.97 real_time=-1 sws_flags=lanczos threads=0 tune=film vcodec=libx264 vf=scale=3840:2160

This script sets up a 1080p timeline with mixed resolution clips to render to 4k utilizing the Lanczos feature in Kdenlive

When I try to use this clip kdenlive changes it to:
acodec=aac channels=2 crf=18 f=mp4 g=15 pix_fmt=yuv420p preset=slow progressive=1 r=29.97 real_time=-1 scale=2 sws_flags=lanczos threads=0 tune=film vcodec=libx264 vf=scale=3840:2160

Notice the addition of scale=2 in the 2nd clip. I didn’t add it, Kdenlive added it, It should not be in the script. The first script works fine, the 2nd one doesn’t. It takes forever to render a file. The first string is about 30% faster to render.

No matter what I do I can’t get Kdenlive to stop adding ‘scale=2’ to my preset. I suspect it is adding it because my project timeline is at 1080p … but not sure about that …

Has anyone had a problem like this, or has a preset script that doesn’t cause this extra verbage to be added … Thx and enjoy editing. You are welcome to email me at is_jnr@yahoo.com to chaapt about this. I also can chat via Viber or WhatsApp after we contact by email. Cheers

2

I tried that with Flatpak 26.04.3 on Pop!_OS and it works without Kdenlive adding any parameters on its own.

They key to making this work is to Enable Manual Editing:

image
image530×537 22.5 KB

Once enabled, paste the parameter set:

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image542×184 14.4 KB

Keep in mind that from that point onward you can edit this preset only via this text box. But you know how to specify parameters anyway, so that shouldn’t be a problem.

3

I finally got it to work in Appimage version. Glad it worked for you … Will you use it? Render is slow, results great. I shoot 3 resolutions of video, edit on 1080p timeline and render to 4k using the script. Usually I just start renders at night and tell Kdenlive to shut down when finished. Thx for reply
Cheers J.R.