Re: Using VLC 4.0.0 on WSL2 Ubuntu 25.04 with wayland

Hello,

Qt interface uses viewporter [1] [2] [3] for the video surface to handle 
fractional scaling. We have to do this for proper embedding, because Qt 
(starting with 6.5) uses viewporter itself to handle fractional scaling 
for the interface surface, and the video surface has to fit properly. In 
this case it seems that you are using SHM display module, which also 
seems to be using viewporter, hence the error.

As far as I know, SHM is not tested with embedding into Qt interface, 
but EGL should be working fine (I was only able to test using EGL GBM 
unfortunately, because of lack of `EGL_KHR_display_reference` support, 
which may be because I'm using Nvidia graphics).

Is there a specific reason opting in for SHM? I'm asking this because as 
far as I know it has lower priority.

Sincerely,
Fatih

[1] https://code.videolan.org/videolan/vlc/-/merge_requests/5721
[2] https://code.videolan.org/videolan/vlc/-/merge_requests/6600
[3] https://code.videolan.org/videolan/vlc/-/merge_requests/6601

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