Package: kdenlive
Version: 19.04.3-2

Hello,

Kdenlive should probably depend on the following qml-module packages:
— qml-module-qtgraphicaleffects,
— qml-module-qtqml-models2,
— qml-module-qtquick-controls2,
— qml-module-qtquick-dialogs,
— qml-module-qtquick-layouts,
— qml-module-qtquick-window2.

You can find them by grepping the source code with something like:

    grep -Fhr 'import Qt' src | cut -d ' ' -f 2-3 | sort | uniq

Although it may be a rare use case, Kdenlive is unusable due to missing
modules if was installed:
1. on buster, and
2. from Deb Multimedia or sid, and
3. with the “--no-install-recommends” option.

A short explanation of the above requirements:
1. I tested it only on buster (reproducible on the Gnome live CD);
2. Kdenlive 18.12 which ships with buster works correctly;
3. if “install-recommends” is enabled, libkf5newstuffcore5 causes
   qml-module-org-kde-newstuff installation, which in turn pulls the
   dependencies that I’ve listed above (libkf5newstuffcore5 _recommends_
   qml-module-org-kde-newstuff) and Kdenlive works correctly.

See also https://bugs.launchpad.net/ubuntu/+source/kdenlive/+bug/1634478
and Debian bug #822279.

Thanks!

-- 
Grzegorz Szymaszek

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