nixos + libvdpau_radeonsi.so

[ffmpeg] CUDA: Cannot load libcuda.so.1
[ffmpeg] CUDA: Could not dynamically load CUDA
[ffmpeg/video] mpeg4: No support for codec mpeg4 profile 15.
[ffmpeg/video] mpeg4: Failed setup for format vaapi: hwaccel initialisation returned error.
[ffmpeg/video] mpeg4: decoding to AV_PIX_FMT_NONE is not supported.
[ffmpeg/video] mpeg4: No support for codec mpeg4 profile 15.
[ffmpeg/video] mpeg4: Failed setup for format vaapi: hwaccel initialisation returned error.
[ffmpeg/video] mpeg4: decoding to AV_PIX_FMT_NONE is not supported.
Failed to open VDPAU backend libvdpau_radeonsi.so: cannot open shared object file: No such file or directory

vdpauinfo 
display: :0.0   screen: 0
Failed to open VDPAU backend libvdpau_radeonsi.so: cannot open shared object file: No such file or directory
Error creating VDPAU device: 1

locate libvdpau_radeonsi.so
/nix/store/9izf19cawajqfav9cj48qccr7mc2f5cb-mesa-25.0.7/lib/vdpau/libvdpau_radeonsi.so
/nix/store/9izf19cawajqfav9cj48qccr7mc2f5cb-mesa-25.0.7/lib/vdpau/libvdpau_radeonsi.so.1
/nix/store/9izf19cawajqfav9cj48qccr7mc2f5cb-mesa-25.0.7/lib/vdpau/libvdpau_radeonsi.so.1.0
/nix/store/9izf19cawajqfav9cj48qccr7mc2f5cb-mesa-25.0.7/lib/vdpau/libvdpau_radeonsi.so.1.0.0
/nix/store/avs0z400pcmwmvlgg3dzx1d68rbihf1m-steam-run-fhsenv-rootfs/usr/lib32/vdpau/libvdpau_radeonsi.so
/nix/store/avs0z400pcmwmvlgg3dzx1d68rbihf1m-steam-run-fhsenv-rootfs/usr/lib32/vdpau/libvdpau_radeonsi.so.1
/nix/store/avs0z400pcmwmvlgg3dzx1d68rbihf1m-steam-run-fhsenv-rootfs/usr/lib32/vdpau/libvdpau_radeonsi.so.1.0
/nix/store/avs0z400pcmwmvlgg3dzx1d68rbihf1m-steam-run-fhsenv-rootfs/usr/lib32/vdpau/libvdpau_radeonsi.so.1.0.0
/nix/store/avs0z400pcmwmvlgg3dzx1d68rbihf1m-steam-run-fhsenv-rootfs/usr/lib64/vdpau/libvdpau_radeonsi.so
/nix/store/avs0z400pcmwmvlgg3dzx1d68rbihf1m-steam-run-fhsenv-rootfs/usr/lib64/vdpau/libvdpau_radeonsi.so.1
/nix/store/avs0z400pcmwmvlgg3dzx1d68rbihf1m-steam-run-fhsenv-rootfs/usr/lib64/vdpau/libvdpau_radeonsi.so.1.0
/nix/store/avs0z400pcmwmvlgg3dzx1d68rbihf1m-steam-run-fhsenv-rootfs/usr/lib64/vdpau/libvdpau_radeonsi.so.1.0.0
/nix/store/cvz1bgx6vhgxi3cfn2bf6wfhfk0l1d5g-graphics-drivers/lib/vdpau/libvdpau_radeonsi.so
/nix/store/cvz1bgx6vhgxi3cfn2bf6wfhfk0l1d5g-graphics-drivers/lib/vdpau/libvdpau_radeonsi.so.1
/nix/store/cvz1bgx6vhgxi3cfn2bf6wfhfk0l1d5g-graphics-drivers/lib/vdpau/libvdpau_radeonsi.so.1.0
/nix/store/cvz1bgx6vhgxi3cfn2bf6wfhfk0l1d5g-graphics-drivers/lib/vdpau/libvdpau_radeonsi.so.1.0.0
/nix/store/klqrrvryc3lv9wd9x0kggr7gq1qraaij-steam-fhsenv-rootfs/usr/lib32/vdpau/libvdpau_radeonsi.so
/nix/store/klqrrvryc3lv9wd9x0kggr7gq1qraaij-steam-fhsenv-rootfs/usr/lib32/vdpau/libvdpau_radeonsi.so.1
/nix/store/klqrrvryc3lv9wd9x0kggr7gq1qraaij-steam-fhsenv-rootfs/usr/lib32/vdpau/libvdpau_radeonsi.so.1.0
/nix/store/klqrrvryc3lv9wd9x0kggr7gq1qraaij-steam-fhsenv-rootfs/usr/lib32/vdpau/libvdpau_radeonsi.so.1.0.0
/nix/store/klqrrvryc3lv9wd9x0kggr7gq1qraaij-steam-fhsenv-rootfs/usr/lib64/vdpau/libvdpau_radeonsi.so
/nix/store/klqrrvryc3lv9wd9x0kggr7gq1qraaij-steam-fhsenv-rootfs/usr/lib64/vdpau/libvdpau_radeonsi.so.1
/nix/store/klqrrvryc3lv9wd9x0kggr7gq1qraaij-steam-fhsenv-rootfs/usr/lib64/vdpau/libvdpau_radeonsi.so.1.0
/nix/store/klqrrvryc3lv9wd9x0kggr7gq1qraaij-steam-fhsenv-rootfs/usr/lib64/vdpau/libvdpau_radeonsi.so.1.0.0
/nix/store/l4myp7qn0q9bqgmkqq4vnnii22ql1r68-mesa-25.0.7/lib/vdpau/libvdpau_radeonsi.so
/nix/store/l4myp7qn0q9bqgmkqq4vnnii22ql1r68-mesa-25.0.7/lib/vdpau/libvdpau_radeonsi.so.1
/nix/store/l4myp7qn0q9bqgmkqq4vnnii22ql1r68-mesa-25.0.7/lib/vdpau/libvdpau_radeonsi.so.1.0
/nix/store/l4myp7qn0q9bqgmkqq4vnnii22ql1r68-mesa-25.0.7/lib/vdpau/libvdpau_radeonsi.so.1.0.0

ls -1 /run/opengl-driver/lib/vdpau/
libvdpau_va_gl.so
libvdpau_va_gl.so.1

environment.sessionVariables = lib.mkIf (videocard == "ryzen7000_amdgpu") {
    LIBVA_DRIVER_NAME = "radeonsi";
    VDPAU_DRIVER = "radeonsi";
  };

  hardware = {
    graphics = {
      enable = true;          
      enable32Bit = true;
      # driSupport = true;  # <-- deprecated
      extraPackages = with pkgs; [
        mesa                  
        libGL                 
        libva-vdpau-driver    
        libvdpau-va-gl        
        libva
      ];
    };
  };

VDPAU_DRIVER=radeonsi VDPAU_DRIVER_PATH="/nix/store/cvz1bgx6vhgxi3cfn2bf6wfhfk0l1d5g-graphics-drivers/lib/vdpau/libvdpau_radeonsi.so" vdpauinfo 
display: :0.0   screen: 0
Failed to open VDPAU backend libvdpau_radeonsi.so: cannot open shared object file: No such file or directory
Error creating VDPAU device: 1

uname -a
Linux desktop-nixos 7.1.5-xanmod1 #1-NixOS SMP PREEMPT_DYNAMIC Tue Jan  1 00:00:00 UTC 1980 x86_64 GNU/Linux