fix detection of amf hw accel on windows (#1519)

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Properly validate filler preset mode pad to require `filler pad to nearest minute` value
 - Fix bug where previously-synchronized collection tags would disappear
   - This bug affected Jellyfin, Emby and Plex collections
+- Fix detection of AMF hardware acceleration on Windows 
 
 ## [0.8.3-beta] - 2023-11-22
 ### Added

ErsatzTV.FFmpeg/Capabilities/FFmpegCapabilities.cs

@@ -27,9 +27,15 @@ public class FFmpegCapabilities : IFFmpegCapabilities
 
     public bool HasHardwareAcceleration(HardwareAccelerationMode hardwareAccelerationMode)
     {
+        // AMF isn't a "hwaccel" in ffmpeg, so check for presence of encoders
+        if (hardwareAccelerationMode is HardwareAccelerationMode.Amf)
+        {
+            return _ffmpegEncoders.Any(
+                e => e.EndsWith($"_{FFmpegKnownHardwareAcceleration.Amf.Name}", StringComparison.OrdinalIgnoreCase));
+        }        
+        
         Option<FFmpegKnownHardwareAcceleration> maybeAccelToCheck = hardwareAccelerationMode switch
         {
-            HardwareAccelerationMode.Amf => FFmpegKnownHardwareAcceleration.Amf,
             HardwareAccelerationMode.Nvenc => FFmpegKnownHardwareAcceleration.Cuda,
             HardwareAccelerationMode.Qsv => FFmpegKnownHardwareAcceleration.Qsv,
             HardwareAccelerationMode.Vaapi => FFmpegKnownHardwareAcceleration.Vaapi,

ErsatzTV.FFmpeg/Capabilities/FFmpegKnownEncoder.cs

@@ -9,5 +9,11 @@ public record FFmpegKnownEncoder
         this.Name = Name;
     }
 
-    public static IList<string> AllEncoders => Array.Empty<string>();
+    // only list the encoders that we actually check for
+    public static IList<string> AllEncoders =>
+        new[]
+        {
+            "h264_amf",
+            "hevc_amf"
+        };
 }