avutil/hwcontext_d3d11va: add logging to dxgi debug interfaces

libavutil/hwcontext_d3d11va.c

@@ -685,9 +685,17 @@ static int d3d11va_device_create(AVHWDeviceContext *ctx, const char *device,
             if (pf_DXGIGetDebugInterface) {
                 IDXGIDebug *dxgi_debug = NULL;
                 hr = pf_DXGIGetDebugInterface(&IID_IDXGIDebug, (void**)&dxgi_debug);
-                if (SUCCEEDED(hr) && dxgi_debug)
+                if (SUCCEEDED(hr) && dxgi_debug) {
                     IDXGIDebug_ReportLiveObjects(dxgi_debug, DXGI_DEBUG_ALL, DXGI_DEBUG_RLO_ALL);
+                    av_log(ctx, AV_LOG_INFO, "Enabled dxgi debugging.\n");
+                } else {
+                    av_log(ctx, AV_LOG_WARNING, "Failed enabling dxgi debugging.\n");
+                }
+            } else {
+                av_log(ctx, AV_LOG_WARNING, "Failed getting dxgi debug interface.\n");
             }
+        } else {
+            av_log(ctx, AV_LOG_WARNING, "Failed loading dxgi debug library.\n");
         }
     }
 #endif