Made the service basically start working

EncodingSampleTest/EncodingSampleTest.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="FFMpegCore" Version="5.4.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <None Update="testVid.mp4">
+        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      </None>
+      <None Update="vendor\ffmpeg.exe">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
+      <None Update="vendor\ffprobe.exe">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
+      <None Update="testVid6K.mp4">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
+      <None Update="testVid8k.mp4">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
+    </ItemGroup>
+
+</Project>

EncodingSampleTest/EncodingSampleTest.csproj.DotSettings

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+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=vendor/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

EncodingSampleTest/NvencExt.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace EncodingSampleTest;
+
+public enum NvencSpeed {
+    Default=0, 
+    Slow=1, 
+    Medium=2, 
+    Fast=3, 
+    p1=12,
+    p2=13,
+    p3=14,
+    p4=15,
+    p5=16,
+    p6=17,
+    p7=18,
+}
+
+public enum NvencTune {
+    hq=1,
+    uhq=5,
+    ll=2,
+    ull=3,
+    lossless=4,
+}
+
+class NvencSpeedPreset(NvencSpeed speed) : FFMpegCore.Arguments.IArgument {
+    public string Text { get { return $"-preset {speed.ToString().ToLower()}"; } }
+}
+
+class NvencTuneArgument(NvencTune tune) : FFMpegCore.Arguments.IArgument {
+    public string Text { get { return $"-tune {tune.ToString().ToLower()}"; } }
+}
+
+class NvencHighBitDepthArgument(bool enable) : FFMpegCore.Arguments.IArgument {
+    public string Text { get { return enable ? "-highbitdepth true" : string.Empty; } }
+}
+
+class NvencQPArgument([Range(-1, 255)]byte qp) : FFMpegCore.Arguments.IArgument {
+    public string Text { get { return $"-qp {qp}"; } }
+}

EncodingSampleTest/Program.cs

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+using System;
+using EncodingSampleTest;
+using FFMpegCore;
+using FFMpegCore.Enums;
+
+string ffmpegPath = Path.Combine(Environment.CurrentDirectory, "vendor");
+string tempPath = Path.Combine(Environment.CurrentDirectory, "tmp");
+string outputDir = Path.Combine(Environment.CurrentDirectory, "output");
+Directory.CreateDirectory(outputDir);
+Directory.CreateDirectory(tempPath);
+const string inputFile = "testVid8k.mp4";
+
+GlobalFFOptions.Configure(options => {
+    options.BinaryFolder = ffmpegPath;
+    options.TemporaryFilesFolder = tempPath;
+});
+
+if(!File.Exists(inputFile)) return;
+
+var mediaInfo = FFProbe.Analyse(inputFile);
+if (mediaInfo.PrimaryVideoStream == null) {
+    Console.WriteLine("No video stream found.");
+    return;
+}
+var W = mediaInfo.PrimaryVideoStream.Width;
+var H = mediaInfo.PrimaryVideoStream.Height;
+
+for (int qp = 32; qp <= 160; qp += 32) {
+    await AV1Encode(W, H, qp);
+}
+
+/*
+for (int qp = 32; qp <= 250; qp += 32) {
+    await AV1Encode(1920, 1080, qp);
+}*/
+
+
+
+Task AV1Encode(int W = -1, int H = -1, int QP = 23) { // AV1 is visually lossless at QP 23
+    var outputFile = Path.Combine(outputDir, $"output_av1-{W}x{H}_qp{QP}.mp4");
+    var ffmpegArgs = FFMpegArguments
+        .FromFileInput(inputFile, true, options => options
+            .WithHardwareAcceleration()
+        )
+        .OutputToFile(outputFile, true, options => options
+            .CopyChannel(Channel.Audio)
+            .CopyChannel(Channel.Subtitle)
+            .WithVideoCodec("hevc_nvenc")
+            .WithArgument(new NvencSpeedPreset(NvencSpeed.p4))
+            .WithArgument(new NvencTuneArgument(NvencTune.hq))
+            .WithArgument(new NvencHighBitDepthArgument(true))
+            .WithArgument(new NvencQPArgument((byte)QP))
+            .WithVideoFilters(filterOptions => {
+                if (W > 0 && H > 0) filterOptions.Scale(W, H);
+            })
+            .WithFastStart()
+        )
+        .WithLogLevel(FFMpegLogLevel.Info)
+        .NotifyOnProgress(progress => Console.WriteLine($"Encoding {outputFile}: {progress:g}/{mediaInfo.Duration:g} {progress/mediaInfo.Duration:P}"));
+    
+    Console.WriteLine(ffmpegArgs.Arguments);
+    
+    var res = ffmpegArgs.ProcessSynchronously();
+    return Task.CompletedTask;
+}