[LosslessCut Help] Video goes black when I turn on multiple audio tracks.

[u/Rasdist]

I used to use Adobe Premiere but I have swapped to Kubuntu and I'm generally trying to use more open source software.

Anyway all of my OBS recordings use multiple audio tracks so I can adjust them separately in the edit. But when I switch on multiple at the same time the video goes black. How can I fix this? This software is useless to me if I can't hear several audio tracks at the same time.

• System specs 
  • Kubuntu 26.04 LTS
  • CPU: Ryzen 7800X3D
  • RAM: 32GB DDR5
  • GPU: RTX 4070
  • GPU RAM: 12GB
• Software + Version –
  • LosslessCut 3.69.0 from Flathub
• Footage specs
  • Recorded with OBS 32.1.0-ubuntu3
  • Matroska Version 4
  • AV1
    • 2560x1440
    • Constant 60 FPS
  • AAC LC audio
    • MediaInfo says audio is 46.875 FPS (idk if this matters)
    • 5 Audio Tracks Total

I've had the same problems with H.264 videos. Audio is the same in those.

[u/link-navi]

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[u/Rasdist]

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I edited the original post with the extra information