I've tried changing the output modes, but only GDI video output seems to do anything (the quality is horrible). Hardware-accelerated decoding is disabled in the codec settings. I've tried both VboxVGA and SVGA adapter modes, as well as toggling 3D acceleration in the guest settings - no luck. The OS is current with updates. Depending on the output mode, I'll see these error messages repeated in VLC's console:
Direct3D 9
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direct3d9 error: Could not read adapter capabilities. (hr=0x8876086a)
direct3d9 error: Direct3D9 could not be opened
direct3d9 error: SetThumbNailClip failed: 0x800706f4
main error: video output creation failed
main error: failed to create video output
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glwin32 error: glCreateShader symbol not found, bailing out
glwin32 error: SetThumbNailClip failed: 0x800706f4 <-- this line isn't present in the non-Windows output mode
main error: video output creation failed
main error: failed to create video output
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freetype warning: DirectWrite initialization failed. Falling back to GDI/Uniscribe
directdraw error: SetThumbNailClip failed: 0x800706f4
Some information:
- Host OS: Windows 10 Pro x64
- Virtualbox versions tested: 6.1.14 and 6.1.16
- Guest additions were installed with D3D support, both matching the virtualbox version
- VLC version 3.0.11
- PAE/NX and VT-x/AMD-V are enabled
- Paravirt. interface is Default, Nested Paging enabled
- Video memory set to 128MB, tried VBoxVGA and SVGA modes, 3D acceleration disabled and enabled.