https://bugs.kde.org/show_bug.cgi?id=415505
Bug ID: 415505
Summary: Kdenlive to cannot import files or open projects when
jack is running.
Product: kdenlive
Version: 18.12.3
Platform: openSUSE RPMs
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: User Interface
Assignee: j...@kdenlive.org
Reporter: k...@dharty.com
Target Milestone: ---
SUMMARY
Importing a video clip or opening a previous project causes kdenlive (18.12.3)
to hang when using the JACK audio server.
DETAILS:
After a recent upgrade of Opensuse, from 15.0 to 15.1, I created a new project
in kdenlive (18.12.3) and tried to import a video clip which cased kdenlive to
hang.
I also tried with the 19.12.0a and 18.12.1b appimages from the kdenlive site,
with the same issue, i.e. hanging when trying to import video clips.
I also tried opening some previously created projects, with similar hangs.
When importing clips, I will see the clip name appear in the Project Bin window
along with a grey thumbnail and a partially completed project bar just
underneath.
On one occasion when starting the kdenlive-18.12.1b-x86_64.appimage, I noticed
the following line in the console output:
'Switching audio backend to: "sdl2_audio" '
I normally run the jack server for audio applications, with the pulse audio
passthrough (JACK D-Bus intrrface to allow pulse applications to go through
jack), so I stopped jack, and kdenlive ran correctly.
Then, I restarted jack followed by kdenlive and saw kdenlive hang when trying
to import a clip.
Then, in pavucontrol, I assigned kdenlive to the "Jack sink (PulseAudio JACK
sink)" audio device instead of the direct device, and kdenlive un-hung.
STEPS TO REPRODUCE
1. start JACK audio server with QJackCTL with the D-Bus Interaface and JACK
D-Bus interface options enabled. Otherwise the jackd command line is:
/usr/bin/jackd -dalsa -r44100 -p256 -n2 -Xseq -D -Chw:CODEC -Phw:CODEC,0
2. Start kdenlive
3. try to import a video clip
OBSERVED RESULT
kdenlive becomes unresponsive and must be terminated unless the audio device
assignment in pavucontrol is changed to jack sink.
EXPECTED RESULT
Kdenlive successfully imports the video clip.
SOFTWARE/OS VERSIONS
OpenSuse 15.1
Linux/KDE Plasma:
KDE Frameworks 5.55.0
Qt 5.9.7 (built against 5.9.7)
The xcb windowing system
ADDITIONAL INFORMATION
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