https://bugs.kde.org/show_bug.cgi?id=414422

            Bug ID: 414422
           Summary: [Snap Package] Clicking "Render" results in D-Bus
                    error on Ubuntu 18.04 an nothing is rendered
           Product: kdenlive
           Version: 19.08.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: critical
          Priority: NOR
         Component: Video Display & Export
          Assignee: j...@kdenlive.org
          Reporter: kleinmeier.bened...@gmail.com
  Target Milestone: ---

Created attachment 124076
  --> https://bugs.kde.org/attachment.cgi?id=124076&action=edit
kdenlive.stderr

SUMMARY

Clicking "Render" results in D-Bus error and no message is shown to user and
nothing is rendered.

I followed the description on the official website:

STEPS TO REPRODUCE
1. I downloaded and installed Kdenlive 19.08.02 Snap package from [1].
2. I run through the quickstart tutorial [2].
3. I clicked on "Render" button in the symbol toolbar and chose "mp4" as export
format.

- [1]: https://snapcraft.io/kdenlive
- [2]: https://userbase.kde.org/Kdenlive/Manual

OBSERVED RESULT

- In GUI, no error message is shown at all and the rendering queue shows only
"Waiting..."
- On stderr following error message is printed:

* CREATED JOB WITH ARGS:  ("/snap/kdenlive/22/usr/bin/melt",
"/tmp/kdenlive-VwucRB.mlt",
"/home/benedikt/Downloads/kdenlive-quickstart/kdenlive-quickstart.mp4",
"-pid:6061")
starting kdenlive_render process using: 
"/snap/kdenlive/22/usr/bin/kdenlive_render"
dbus[6223]: arguments to dbus_message_new_method_call() were incorrect,
assertion "_dbus_check_is_valid_path (path)" failed in file
../../../dbus/dbus-message.c line 1366.
This is normally a bug in some application using the D-Bus library.

EXPECTED RESULT

At least, the (GUI) user should be informed with an error box. And above all,
kdenlive should render the video correctly by using D-Bus properly.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 18.04.3 LTS/
The "About" dialog of the 19.08.2 snap package reports:
- KDE Frameworks 5.61.0
- Qt 5.12.3 (kompiliert gegen 5.12.3)
- Das xcb Fenstersystem

ADDITIONAL INFORMATION

stderr is attached.

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