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?

[szatox]

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

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lrwxrwxrwx 1 root root 17 2024-03-28   /usr/lib/ladspa -> /usr/lib64/ladspa
lrwxrwxrwx 1 root root 15 2024-03-28   /usr/lib/lv2 -> /usr/lib64/lv2

I consider it a workaround rather than a proper solution, but it works, so whatever

[gkmac]

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.

[szatox]

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.

[gkmac]

Have you enabled ladspa USE flag? ... Same thing applies to lv2.

The kdenlive ebuild itself does not have either of those USE flags.

I've enabled both those USE flags, re-emerged everything that used those USE flags and re-emerged kdenlive yet again afterwards. Still no change.

[szatox]

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.

starting kdenlive from the command line reveals a few lines of plugin not available: "ladspa"

Kinda grasping at straws here, but a bunch of things depend on media-libs/ladspa-sdk. Could it be a missing dependency?
Does kdenlive have a verbose or debug switch enabling more detailed messages?

In the end, there's always the option of running kdenlive under strace. It does print e.g. calls to open a file, which may tell you what exactly it can't find, as well as a bunch of other things we wouldn't guess to ask about, but might still recognize as a problem when we see it.

[Hu]

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]

gkmac.

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

Does

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ladspa_declipper.xml
ladspa_equalizer.xml
ladspa_equalizer_15.xml
ladspa_librnnoise.xml
ladspa_limiter.xml
ladspa_phaser.xml
ladspa_pitch.xml
ladspa_pitch_scale.xml
ladspa_rate_scale.xml
ladspa_reverb.xml
ladspa_room_reverb.xml
ladspa_vinyl.xml

Ring any bell?

Do you know where is ${KDE_INSTALL_DATADIR}${DATA_INSTALL_PREFIX}/effects)?

Can you find for example am_pitchshift_1433.so on your file system?

I can dig deeper but just want to understand current state on your setting for now. Will try tomorrow.

[ecko]

I have the same issue. I have kdenlive-24.12.0, media-libs/mlt-7.28.0-r1, and I installed media-plugins/gst-plugins-ladspa-1.22.12. The ladspa plugins don't appear in kdenlive. Like the above poster, the CLI reports several times 'plugin not available: "ladspa"'.

The strace command above has several lines of the kind:

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20802 22:45:40.280080 openat(AT_FDCWD</home/USER/MY/PATH>, "/usr/share/kdenlive/effects/ladspa_limiter.xml", O_RDONLY|O_CLOEXEC) = 37</usr/share/kdenlive/effects/ladspa_limiter.xml>

These xml files in /usr/share do exist on the disk. I am not sure if the effects show up in kdenlive (I don't think so) but anyway are a small fraction of the LADSPA effects that should appear, as per https://docs.kdenlive.org/en/effects_an ... _list.html

[ecko]

Can you find for example am_pitchshift_1433.so on your file system?

In my case, media-libs/ladspa-sdk-1.17-r2 only has the following so files:

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/usr/lib64/ladspa/amp.so
/usr/lib64/ladspa/delay.so
/usr/lib64/ladspa/filter.so
/usr/lib64/ladspa/noise.so
/usr/lib64/ladspa/sine.so

and media-plugins/gst-plugins-ladspa only has /usr/lib64/gstreamer-1.0/libgstladspa.so

Filename am_pitchshift_1433.so does not exist on my filesystem ( find / -xdev -name am_p* ).



Additional note:

• MLT seems to give access to the LADSPA filters https://www.mltframework.org/plugins/FilterLadspa-1404/ (but they don't show up this way either)
• related to the sound plugins, kdenlive website says "Kdenlive will auto-detect and make available any supported LADSPA plug-in packages from your distribution. For the greatest compatibility, please use the AppImage version of Kdenlive." https://docs.kdenlive.org/en/effects_an ... _list.html But as I tried, the AppImage version gives an error at launch ("Could not create the video preview window. There is something wrong with your Kdenlive install or your driver settings, please fix it.") then segfaults. So I cannot test the LADSPA plugins with the AppImage version.

[pingtoo]

The "am_pitchshift_1433.so" came from media-plugins/swh-plugins.

[ecko]

I installed cmt-plugins, tap-plugins, swh-plugins and rebuilt kdenlive. I have "/usr/lib64/ladspa/am_pitchshift_1433.so". The results are the same with kdenlive (same CLI messages, same audio filters available), with kdenlive-24.12.0 and -24.08.3.

[pingtoo]

I installed cmt-plugins, tap-plugins, swh-plugins and rebuilt kdenlive. I have "/usr/lib64/ladspa/am_pitchshift_1433.so". The results are the same with kdenlive (same CLI messages, same audio filters available), with kdenlive-24.12.0 and -24.08.3.

I don't have kdenlive on my system, so I can not really tell you where to look. But I vaguely remember when I do the research about this. I remember I saw somewhere said that item is hidden somewhere in the menu system it is not obvious that it is use the plugins but if you don't have them install the menu item will gray out.