Try Vulkan if CUDA is not available

src/video_core/host1x/ffmpeg/ffmpeg.cpp

@@ -26,18 +26,21 @@ namespace {
 constexpr AVPixelFormat PreferredGpuFormat = AV_PIX_FMT_NV12;
 constexpr AVPixelFormat PreferredCpuFormat = AV_PIX_FMT_YUV420P;
 constexpr std::array PreferredGpuDecoders = {
-#if defined (_WIN32)
+#if defined(_WIN32)
     AV_HWDEVICE_TYPE_CUDA,
+    AV_HWDEVICE_TYPE_VULKAN,
     AV_HWDEVICE_TYPE_D3D11VA,
     AV_HWDEVICE_TYPE_DXVA2,
 #elif defined(__FreeBSD__)
     AV_HWDEVICE_TYPE_VDPAU,
-#elif defined(__unix__)
+#elif defined(__linux__)
     AV_HWDEVICE_TYPE_CUDA,
+    AV_HWDEVICE_TYPE_VULKAN,
     AV_HWDEVICE_TYPE_VAAPI,
     AV_HWDEVICE_TYPE_VDPAU,
-#endif
+#else
     AV_HWDEVICE_TYPE_VULKAN,
+#endif
 };
 
 AVPixelFormat GetGpuFormat(AVCodecContext* codec_context, const AVPixelFormat* pix_fmts) {