gxtuner hangs lv2rack

[Jens]

Ubuntustudio 15.04 both as installed offline from DVD, and all upgrades done, on 2 different amd64 machines:

When running LV2Rack, loading an effect for the first time triggers a scan, that hangs when processing gxtuner, a URL is shown.

After some reinstalling packages and attempting downgrade of zynjacku that lv2rack belongs to, now finally I got things working by renaming /usr/lib/lv2/gxtuner.lv2 to ./gxtuner.lv2.bak .

Reading manpages, namely slv2_world, is what set me on the track.

So the primary bug, I assume, is something malformed in gxtuner.lv2 as found in the distro (on top I understand that gxtuner could come from different packages).

Secondary, and more seriously, this leads to a hang and complete unusability of lv2rack .

Ardour3 does not show any problems with scanning lv2 effects, so looking at the different ways of lv2rack and ardour to find lv2 plugins might help pinpoint the problem, possibly in slv2

Since I live offgrid and offline, I cannot be counted on for follow ups too much

[Yorwos Paschalidis (tekes600)]

same hapenned to me upgprading from 14.04 to 16.04.1
thnx for the temp idea renaming the folder

[Len Ovens (len-ovenwerks)]

I would suggest using jalv.gtk over lv2rack. Carla would be even better, but it is not in the Ubuntu repos at this time. I am not sure what is happening with zynjacku at this time the home page points to a git repo that is empty (has no commits). It seems there is no upstream. LV2 has changed and I suspect zynjacku (which is the package lv2rack comes from) has not kept up. (last release date 2009?)

[Jens (juanflautista)]

Let's add in this case that Carla is available from the kxstudio project, which has a distro of it's own, but adding its goodies to an UbuntuStudio install is as easy as downlowding a .deb file, manually installing it (with sudo dpkg -i [path to debfile] if must be, but .deb files should be automatically opened and slowly installed by the Software Center if clicked), and voilá! , if you update packages in synaptic, everything from the kxstudio repos that fits into your Ubuntu version, is available, Carla included. Note, though, that if later you choose to update all packages that have newer versions available, often kxstudio packages will get picked over the ubuntu ones, also kxstudio packages might depend on newer/other versions of libraries, but usually this is no worry.
Btw, here's a random find, doesn't look very active, but at least there's an email : http://repo.or.cz/zynjacku.git

-------- Original Message --------
From: Len Ovens <email address hidden>
Sent: August 4, 2016 11:59:57 PM GMT+01:00
To: <email address hidden>
Subject: [Bug 1585007] Re: gxtuner hangs lv2rack

I would suggest using jalv.gtk over lv2rack. Carla would be even better,
but it is not in the Ubuntu repos at this time. I am not sure what is
happening with zynjacku at this time the home page points to a git repo
that is empty (has no commits). It seems there is no upstream. LV2 has
changed and I suspect zynjacku (which is the package lv2rack comes from)
has not kept up. (last release date 2009?)

[Erich Eickmeyer (eeickmeyer)]

A fix for this should be headed to Ubuntu 19.04 in the form of Carla, and backported into the backport PPA (ppa:ubuntustudio-ppa/backports). Granted this doesn't fix 16.04, but 16.04 is EOL in roughly a month. Marking as fix committed for now.