kdenlive: cannot use ladspa plugin

gkmac

In kdenlive it's apparently possible to use LADSPA plugins but I cannot get them working at all, specificly the "noise-suppression-for-voice" plugin.

There are guides for getting it working on other distros such as this one which mention compiling it from source and copying librnnoise_ladspa.so into /usr/lib/ladspa; that's precisely what the Gentoo ebuild does (in Gentoo's case it goes into /usr/lib64/ladspa). The guides simply say "restart kdenlive afterwards and you'll find it by searching in the Effects list" but it never appears for me.

The effect is visible in Audacity so the plugin is definitely there, but starting kdenlive from the command line reveals a few lines of plugin not available: "ladspa"

I've tried re-emerging kdenlive and I've even tried installing ladspa-sdk then re-emerging kdenlive afterwards, but it still persists with those plugin not available: "ladspa" warnings and searching for "noise" in the effects list still shows no sign of "Noise Suppressor for Voice".

Any ideas?
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szatox · Advocate Joined: 27 Aug 2013 Posts: 3477

This looks like the same problem I had with easyeffects. And this is how I solved it:

gkmac · Posted: Tue Oct 22, 2024 9:03 pm Post subject:

Good thinking about those symlinks. Unfortunately it doesn't work, still getting plugin not available: "ladspa" and still no sign of the plugin appearing in kdenlive.
_________________
If ~amd64 ebuilds are cutting edge, then git-9999 ebuilds are chainsaws.
"Not everyone can ride a unicycle, does that mean we should put another wheel on it?" - Lokheed

szatox · Advocate Joined: 27 Aug 2013 Posts: 3477

Well, if it's not the location, then maybe some dependency needs an interface?
Have you enabled ladspa USE flag? Kdenlive doesn't like my configuration, so I can't just --pretend install it do see the all dependencies, but I remember it being opt-in for my toys. Same thing applies to lv2.
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gkmac · Posted: Tue Oct 22, 2024 9:56 pm Post subject:

szatox · Advocate Joined: 27 Aug 2013 Posts: 3477

Damn, that's not good. I'm outside of familiar territory now and it's pretty hard to come up with new ideas without having the problem right in front of me.

Hu · Administrator Joined: 06 Mar 2007 Posts: 22863

If you go the strace route, I suggest starting with strace --decode-fds -e trace=file -f -tt -o /tmp/kdenlive.strace kdenlive --arg1 --arg2. By restricting it to file related operations, we can cut down on noise, and hopefully not cut out the critical piece. You could omit -e trace=file to get a much more verbose trace.

pingtoo · Posted: Wed Oct 23, 2024 12:22 am Post subject:

gkmac.

I did a quick search in KDE/kdenlive source code for word "ladspa".

Does