SUMMARY
White screen rendering instead of text

STEPS TO REPRODUCE
1.  Render a long video using Matroska/AAC (H.264)
2. 
3. 

OBSERVED RESULT
Renders white screen in container

EXPECTED RESULT
Text should also be rendered

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Linux Mint.
KDE Frameworks Version: libmlt7 (7.22.0).
Qt Version: Qt 5 (5.15.3) and Qt 6 (6.4.2).

ADDITIONAL INFORMATION
System information

System:
  Host: tarun-Precision-3561 Kernel: 6.8.0-53-generic arch: x86_64 bits: 64
  Desktop: Cinnamon v: 6.4.7 Distro: Linux Mint 22.1 Xia
Machine:
  Type: Laptop System: Dell product: Precision 3561 v: N/A
    serial: <superuser required>
  Mobo: Dell model: 03G764 v: A00 serial: <superuser required> UEFI: Dell
    v: 1.32.0 date: 08/05/2024
Battery:
  ID-1: BAT0 charge: 24.2 Wh (100.0%) condition: 24.2/64.0 Wh (37.8%)
CPU:
  Info: 8-core model: 11th Gen Intel Core i7-11850H bits: 64 type: MT MCP
    cache: L2: 10 MiB
  Speed (MHz): avg: 1642 min/max: 800/4800 cores: 1: 800 2: 800 3: 4450
    4: 4800 5: 800 6: 800 7: 3546 8: 2020 9: 800 10: 800 11: 800 12: 800 13: 800
    14: 2665 15: 800 16: 800
Graphics:
  Device-1: Intel TigerLake-H GT1 [UHD Graphics] driver: i915 v: kernel
  Device-2: NVIDIA TU117GLM [T600 Mobile] driver: nvidia v: 550.120
  Device-3: Sunplus Innovation Integrated_Webcam_HD driver: uvcvideo
    type: USB
  Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6 driver: X:
    loaded: modesetting,nvidia unloaded: fbdev,nouveau,vesa dri: iris gpu: i915
    resolution: 1920x1080~60Hz
  API: EGL v: 1.5 drivers: iris,nvidia,swrast
    platforms: gbm,x11,surfaceless,device
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: intel mesa
    v: 24.2.8-1ubuntu1~24.04.1 renderer: Mesa Intel UHD Graphics (TGL GT1)
  API: Vulkan v: 1.3.275 drivers: N/A surfaces: xcb,xlib
Audio:
  Device-1: Intel Tiger Lake-H HD Audio driver: snd_hda_intel
  API: ALSA v: k6.8.0-53-generic status: kernel-api
  Server-1: PipeWire v: 1.0.5 status: active
Network:
  Device-1: Intel Tiger Lake PCH CNVi WiFi driver: iwlwifi
  IF: wlp0s20f3 state: up mac: 2c:6d:c1:30:a7:f5
  Device-2: Intel Ethernet I219-LM driver: e1000e
  IF: enp0s31f6 state: down mac: b4:45:06:5c:86:21
RAID:
  Hardware-1: Intel Volume Management Device NVMe RAID Controller driver: vmd
Drives:
  Local Storage: total: 476.94 GiB used: 111.1 GiB (23.3%)
  ID-1: /dev/nvme0n1 vendor: Toshiba model: KBG40ZNS512G NVMe KIOXIA 512GB
    size: 476.94 GiB
Partition:
  ID-1: / size: 467.89 GiB used: 111.09 GiB (23.7%) fs: ext4
    dev: /dev/nvme0n1p2
  ID-2: /boot/efi size: 511 MiB used: 6.2 MiB (1.2%) fs: vfat
    dev: /dev/nvme0n1p1
Swap:
  ID-1: swap-1 type: file size: 2 GiB used: 0 KiB (0.0%) file: /swapfile
Sensors:
  System Temperatures: cpu: 72.0 C mobo: N/A
  Fan Speeds (rpm): N/A
Info:
  Memory: total: 32 GiB note: est. available: 31.08 GiB used: 3.96 GiB (12.7%)
  Processes: 374 Uptime: 5h 10m Shell: Bash inxi: 3.3.34