fix vaapi rate control mode (#1340)

CHANGELOG.md

@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 - Only allow a single instance of ErsatzTV to run
   - This fixes some cases where the search index would become unusable
+- Fix VAAPI rate control mode capability check 
 
 ### Changed
 - Rework startup process to show UI as early as possible

ErsatzTV.FFmpeg/Pipeline/VaapiPipelineBuilder.cs

@@ -198,7 +198,7 @@ public class VaapiPipelineBuilder : SoftwarePipelineBuilder
         if (pipelineSteps.OfType<IEncoder>().All(e => e.Kind != StreamKind.Video))
         {
             RateControlMode rateControlMode =
-                _hardwareCapabilities.GetRateControlMode(videoStream.Codec, videoStream.PixelFormat)
+                _hardwareCapabilities.GetRateControlMode(desiredState.VideoFormat, desiredState.PixelFormat)
                     .IfNone(RateControlMode.VBR);
             
             Option<IEncoder> maybeEncoder =