https://bugs.kde.org/show_bug.cgi?id=459569

            Bug ID: 459569
           Summary: Rendering in MP4 or MKV crashed  Qt: Session
                    management error: None of the authentication protocols
                    specified are supported
    Classification: Applications
           Product: kdenlive
           Version: 22.08.1
          Platform: Ubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Display & Export
          Assignee: j...@kdenlive.org
          Reporter: nicolas.ko...@proton.me
  Target Milestone: ---

SUMMARY

Following a previous bug report I am using the Kdenlive AppImage.
I have made many rendering operations while working on several video that
proceeded smoothly. 
Just as I made fine tuning to a video that rendered without any problem
rendering now crashes everytime I am attempting to produce an mp4 or mkv file.
Webm, high quality gif, or mpg2 are not an issue. 

Examples of log crash reports for mp4 files:

Started render process: /app/bin/melt -progress /var/tmp/kdenlive-rFfvsZ.mlt
out=308
Qt: Session management error: None of the authentication protocols specified
are supported
1       35      11
2       114     36
3       186     60
Rendering of /home/nicolas/Downloads/ppPLUSLogoIntroc.mp4 aborted, resulting
video will probably be corrupted.
Frame: 186

Started render process: /app/bin/melt -progress /var/tmp/kdenlive-GSJDyF.mlt
out=308
Qt: Session management error: None of the authentication protocols specified
are supported
1       32      10
2       88      28
3       165     53
Rendering of /home/nicolas/Downloads/ppPLUSLogoIntro10sec.mp4 aborted,
resulting video will probably be corrupted.
Frame: 165

STEPS TO REPRODUCE
1. Start Kdenlive
2. Open recent project
3. Render to file

OBSERVED RESULT

Rendering file crashed

EXPECTED RESULT

Rendering succeded

SOFTWARE/OS VERSIONS
System:
  Kernel: 5.15.0-48-generic x86_64 bits: 64 compiler: gcc v: 11.2.0
    Desktop: GNOME 42.4 Distro: Ubuntu 22.04.1 LTS (Jammy Jellyfish)
Machine:
  Type: Desktop Mobo: Gigabyte model: Z97X-UD5H v: x.x
    serial: <superuser required> UEFI: American Megatrends v: F10
    date: 08/03/2015
CPU:
  Info: quad core model: Intel Core i7-4790 bits: 64 type: MT MCP
    arch: Haswell rev: 3 cache: L1: 256 KiB L2: 1024 KiB L3: 8 MiB
  Speed (MHz): avg: 3769 high: 3983 min/max: 800/4000 cores: 1: 3981
    2: 2970 3: 3899 4: 3452 5: 3983 6: 3959 7: 3960 8: 3955 bogomips: 57471
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics
    vendor: Gigabyte driver: i915 v: kernel bus-ID: 00:02.0
  Device-2: NVIDIA GM200 [GeForce GTX TITAN X] vendor: eVga.com.
    driver: nvidia v: 515.65.01 bus-ID: 01:00.0
  Device-3: Microsoft LifeCam HD-3000 type: USB
    driver: snd-usb-audio,uvcvideo bus-ID: 3-10:6
  Display: x11 server: X.Org v: 1.21.1.3 driver: X:
    loaded: modesetting,nvidia unloaded: fbdev,nouveau,vesa gpu: i915,nvidia
    resolution: 1: 3840x2160~60Hz 2: 3840x2160~60Hz
  OpenGL: renderer: NVIDIA GeForce GTX TITAN X/PCIe/SSE2
    v: 4.6.0 NVIDIA 515.65.01 direct render: Yes
Audio:
  Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio
    driver: snd_hda_intel v: kernel bus-ID: 00:03.0
  Device-2: Intel 9 Series Family HD Audio vendor: Gigabyte
    driver: snd_hda_intel v: kernel bus-ID: 00:1b.0
  Device-3: NVIDIA GM200 High Definition Audio vendor: eVga.com.
    driver: snd_hda_intel v: kernel bus-ID: 01:00.1
  Device-4: C-Media CMI8788 [Oxygen HD Audio] vendor: ASUSTeK Virtuoso 100
    driver: snd_virtuoso v: kernel bus-ID: 08:04.0
  Device-5: Microsoft LifeCam HD-3000 type: USB
    driver: snd-usb-audio,uvcvideo bus-ID: 3-10:6
  Device-6: Logitech Headset H340 type: USB
    driver: hid-generic,snd-usb-audio,usbhid bus-ID: 3-5:3
  Sound Server-1: ALSA v: k5.15.0-48-generic running: yes
  Sound Server-2: PulseAudio v: 15.99.1 running: yes
  Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
  Device-1: Intel Ethernet I217-V vendor: Gigabyte driver: e1000e v: kernel
    port: f080 bus-ID: 00:19.0
  IF: eno1 state: down mac: <filter>
  Device-2: Broadcom BCM4360 802.11ac Wireless Network Adapter
    vendor: ASUSTeK driver: wl v: kernel bus-ID: 02:00.0
  IF: wlp2s0 state: up mac: <filter>
  Device-3: Qualcomm Atheros Killer E220x Gigabit Ethernet vendor: Gigabyte
    driver: alx v: kernel port: d000 bus-ID: 04:00.0
  IF: enp4s0 state: down mac: <filter>
  IF-ID-1: ipv6leakintrf0 state: unknown speed: N/A duplex: N/A
    mac: <filter>
  IF-ID-2: proton0 state: unknown speed: 10 Mbps duplex: full mac: N/A
Drives:
  Local Storage: total: 931.51 GiB used: 532.3 GiB (57.1%)
  ID-1: /dev/nvme0n1 vendor: Smart Modular Tech. model: SHGP31-1000GM-2
    size: 931.51 GiB temp: 47.9 C
Partition:
  ID-1: / size: 912.73 GiB used: 532.05 GiB (58.3%) fs: ext4 dev: /dev/dm-1
    mapped: vgubuntu-root
  ID-2: /boot size: 1.61 GiB used: 254.4 MiB (15.5%) fs: ext4
    dev: /dev/nvme0n1p2
  ID-3: /boot/efi size: 511 MiB used: 5.2 MiB (1.0%) fs: vfat
    dev: /dev/nvme0n1p1
Swap:
  ID-1: swap-1 type: partition size: 976 MiB used: 0 KiB (0.0%)
    dev: /dev/dm-2 mapped: vgubuntu-swap_1
Sensors:
  System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nvidia temp: 71 C
  Fan Speeds (RPM): N/A gpu: nvidia fan: 31%
Info:
  Processes: 334 Uptime: 1h 23m Memory: 31.2 GiB used: 7.78 GiB (24.9%)
  Init: systemd runlevel: 5 Compilers: gcc: 11.3.0 Packages: 2679 Shell: Bash
  v: 5.1.16 inxi: 3.3.13

ADDITIONAL INFORMATION
As mentioned, I am using the AppImage.

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