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[Erich Eickmeyer <1909022@xxxxxxxxxxxxxxxxxx>]

Calf is already aware of Ardour's policy in that one should not use Calf
on Ardour. (See https://github.com/calf-studio-gear/calf/issues/181)
Since that's where the upstream projects lie, I wouldn't worry about it.

That said, there's unfortunately nothing anybody that sees this bug
report can do since Ardour 6 (latest version) doesn't even allow the use
of Calf plugins. Calf is very low quality and crash prone, and I suggest
switching to lsp-plugins for what you're trying to do.

Since this isn't a bug within Ubuntu's control and support is outside
the scope of a bug tracker, this bug remains invalid. If anything, the
bug would get changed to "won't fix" since both projects are aware of
the issue but have no interest in changing the situation.

** Bug watch added: github.com/calf-studio-gear/calf/issues #181
   https://github.com/calf-studio-gear/calf/issues/181

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https://bugs.launchpad.net/bugs/1909022

Title:
  Ardour crashes when using the Calf Limiter LV2 plugin and tying to
  raise the Oversampling parameter to 4

Status in calf package in Ubuntu:
  Invalid

Bug description:
  About my system:
  It's a new KDE Slimbook with KDE neon pre-installed, which itself is based on Ubuntu focal.
  I used aptitude to install ardour, calf-plugins, and some other stuff I need to do my audio work.
  All installed packages are up-to-date, there are no pending updates.

  List of relevant installed packages:
  ii  ardour         1:5.12.0-3ubuntu4 amd64        the digital audio workstation
  ii  calf-plugins   0.90.3-1build2    amd64        Calf Studio Gear ...

  
  Steps to reproduce 1:
  - Open a new/blank Ardour workspace
  - Add the "Calf Limiter" plugin (LV2) to the Master bus
  - Double-click on the plugin to see its GUI
  - Try to raise the "Oversampling" value to 4 using the knob => crash

  
  Steps to reproduce 2:
  - Open an existing Ardour workspace where the Calf Limiter plugin is present already having an Oversampling value of 4.
  - In this case Ardour will crash right during the startup.
  - Workaround:
    - start Ardour with the '-B' option
    - activate all plugins (except the Limiter, which also would lead to an immediate crash)
    - open the Limiter and turn "Oversampling" down to 1.
    - then the Limiter plugin can be activated and everything works fine.

  
  PS:
  I noticed this bug after I was rsync'ing my audio workspaces from my PC (based on Debian/buster) to the new laptop. All workspaces and plugins (whether Calf, Guitarix, whatever) worked fine, except for my "mastering" workspace which is using the Calf Limiter plugin.

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