Bug#962391: obs-studio: Segfaults when set to monitor desktop audio output

[Lucio Crusca <lucio@sulweb.org>]

Package: obs-studio
Version: 25.0.8+dfsg1-2
Severity: normal

Dear Maintainer,


   * What led up to the situation?

I remove $HOME/.config/obs-studio, I start OBS and skip the auto-configuration wizard.
I add a new Audio Output Capture (PulseAudio) source, click Ok in the "Create/Select source" dialog and click Ok in the "Properties for 'Audio Output Capture (PulseAudio)'" dialog. Please note that the "Device" select box in the latter dialog is empty, but I don't know if that's normal.
The new source VU-meter shows up in the mixer, but it doesn't move when I play something in the desktop. Then I click the gear icon next to it and choose "Advanced Audio Properties".
I see the audio source listed as active, but the "Audio Monitoring" select box shows "Monitor off". I click it and choose "Monitor Only (mute output)" instead. OBS segfaults as soon as I click that item. The same happens if I choose "Monitor and Output". Now OBS segfaults at startup and I have to remove $HOME/.config/obs-studio again.

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (990, 'testing'), (900, 'stable'), (800, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.6.3-fx (SMP w/8 CPU cores; PREEMPT)
Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8), LANGUAGE=it_IT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages obs-studio depends on:
ii  libavcodec58      7:4.2.2-1+b1
ii  libavformat58     7:4.2.2-1+b1
ii  libavutil56       7:4.2.2-1+b1
ii  libc6             2.30-8
ii  libcurl3-gnutls   7.68.0-1
ii  libgcc-s1         10.1.0-3
ii  libluajit-5.1-2   2.1.0~beta3+dfsg-5.1
ii  libobs0           25.0.8+dfsg1-2
ii  libpython3.8      3.8.3-1
ii  libqt5core5a      5.12.5+dfsg-10
ii  libqt5gui5        5.12.5+dfsg-10
ii  libqt5svg5        5.12.5-2
ii  libqt5widgets5    5.12.5+dfsg-10
ii  libqt5x11extras5  5.12.5-1
ii  libqt5xml5        5.12.5+dfsg-10
ii  libstdc++6        10.1.0-3
ii  obs-plugins       25.0.8+dfsg1-2
ii  python3           3.8.2-3
ii  python3.8         3.8.3-1

obs-studio recommends no packages.

obs-studio suggests no packages.

-- no debconf information