fix hw accel

ErsatzTV.FFmpeg/GlobalOption/HardwareAcceleration/VaapiHardwareAccelerationOption.cs

@@ -5,17 +5,28 @@ namespace ErsatzTV.FFmpeg.GlobalOption.HardwareAcceleration;
 public class VaapiHardwareAccelerationOption : GlobalOption
 {
     private readonly FFmpegCapability _decodeCapability;
-    private readonly string _vaapiDevice;
+    private readonly Option<string> _vaapiDevice;
 
-    public VaapiHardwareAccelerationOption(string vaapiDevice, FFmpegCapability decodeCapability)
+    public VaapiHardwareAccelerationOption(Option<string> vaapiDevice, FFmpegCapability decodeCapability)
     {
         _vaapiDevice = vaapiDevice;
         _decodeCapability = decodeCapability;
     }
 
-    public override string[] GlobalOptions => _decodeCapability == FFmpegCapability.Hardware
-        ? new[] { "-hwaccel", "vaapi", "-vaapi_device", _vaapiDevice }
-        : new[] { "-vaapi_device", _vaapiDevice };
+    public override string[] GlobalOptions
+    {
+        get
+        {
+            foreach (string vaapiDevice in _vaapiDevice)
+            {
+                return _decodeCapability == FFmpegCapability.Hardware
+                    ? ["-hwaccel", "vaapi", "-vaapi_device", vaapiDevice]
+                    : ["-vaapi_device", vaapiDevice];
+            }
+
+            return [ "-hwaccel", "vaapi" ];
+        }
+    }
 
     public override FrameState NextState(FrameState currentState) => currentState with
     {

ErsatzTV.FFmpeg/Pipeline/VaapiPipelineBuilder.cs

@@ -80,14 +80,14 @@ public class VaapiPipelineBuilder : SoftwarePipelineBuilder
             pipelineSteps.Add(new LibvaDriverNameVariable(driverName));
         }
 
+        Option<string> vaapiDevice = ffmpegState.VaapiDevice;
         if (ffmpegState.VaapiDisplay.IfNone("drm") == "drm")
         {
-            foreach (string vaapiDevice in ffmpegState.VaapiDevice)
-            {
-                pipelineSteps.Add(new VaapiHardwareAccelerationOption(vaapiDevice, decodeCapability));
-            }
+            vaapiDevice = Option<string>.None;
         }
 
+        pipelineSteps.Add(new VaapiHardwareAccelerationOption(vaapiDevice, decodeCapability));
+
         // use software decoding with an extensive pipeline
         if (context is { HasSubtitleOverlay: true, HasWatermark: true })
         {