properly fall back to software pipeline (#1084)

ErsatzTV.FFmpeg/Capabilities/NoHardwareCapabilities.cs

@@ -4,6 +4,9 @@ namespace ErsatzTV.FFmpeg.Capabilities;
 
 public class NoHardwareCapabilities : IHardwareCapabilities
 {
-    public bool CanDecode(string videoFormat, Option<string> videoProfile, Option<IPixelFormat> maybePixelFormat) => false;
-    public bool CanEncode(string videoFormat, Option<string> videoProfile, Option<IPixelFormat> maybePixelFormat) => false;
+    public bool CanDecode(string videoFormat, Option<string> videoProfile, Option<IPixelFormat> maybePixelFormat) =>
+        false;
+
+    public bool CanEncode(string videoFormat, Option<string> videoProfile, Option<IPixelFormat> maybePixelFormat) =>
+        false;
 }

ErsatzTV.FFmpeg/Pipeline/PipelineBuilderFactory.cs

@@ -40,7 +40,7 @@ public class PipelineBuilderFactory : IPipelineBuilderFactory
 
         return hardwareAccelerationMode switch
         {
-            HardwareAccelerationMode.Nvenc => new NvidiaPipelineBuilder(
+            HardwareAccelerationMode.Nvenc when capabilities is not NoHardwareCapabilities => new NvidiaPipelineBuilder(
                 capabilities,
                 hardwareAccelerationMode,
                 videoInputFile,
@@ -50,7 +50,7 @@ public class PipelineBuilderFactory : IPipelineBuilderFactory
                 reportsFolder,
                 fontsFolder,
                 _logger),
-            HardwareAccelerationMode.Vaapi => new VaapiPipelineBuilder(
+            HardwareAccelerationMode.Vaapi when capabilities is not NoHardwareCapabilities => new VaapiPipelineBuilder(
                 capabilities,
                 hardwareAccelerationMode,
                 videoInputFile,
@@ -91,7 +91,7 @@ public class PipelineBuilderFactory : IPipelineBuilderFactory
                 fontsFolder,
                 _logger),
             _ => new SoftwarePipelineBuilder(
-                hardwareAccelerationMode,
+                HardwareAccelerationMode.None,
                 videoInputFile,
                 audioInputFile,
                 watermarkInputFile,