Updated based on review feedback

Emby.Server.Implementations/AppBase/ConfigurationHelper.cs

@@ -36,7 +36,7 @@ namespace Emby.Server.Implementations.AppBase
             }
             catch (Exception)
             {
-                configuration = Activator.CreateInstance(type) ?? throw new ResourceNotFoundException(nameof(type));
+                configuration = Activator.CreateInstance(type) ?? throw new ArgumentException($"Provided path ({type}) is not valid.", nameof(type));
             }
 
             using var stream = new MemoryStream(buffer?.Length ?? 0);
@@ -49,7 +49,7 @@ namespace Emby.Server.Implementations.AppBase
             // If the file didn't exist before, or if something has changed, re-save
             if (buffer == null || !newBytes.AsSpan(0, newBytesLen).SequenceEqual(buffer))
             {
-                var directory = Path.GetDirectoryName(path) ?? throw new ResourceNotFoundException(nameof(path));
+                var directory = Path.GetDirectoryName(path) ?? throw new ArgumentException($"Provided path ({path}) is not valid.", nameof(path));
 
                 Directory.CreateDirectory(directory);
                 // Save it after load in case we got new items

Emby.Server.Implementations/Cryptography/CryptographyProvider.cs

@@ -81,7 +81,7 @@ namespace Emby.Server.Implementations.Cryptography
                 throw new CryptographicException($"Requested hash method is not supported: {hashMethod}");
             }
 
-            using var h = HashAlgorithm.Create(hashMethod) ?? throw new ResourceNotFoundException(nameof(hashMethod));
+            using var h = HashAlgorithm.Create(hashMethod) ?? throw new ResourceNotFoundException($"Unknown hash method: {hashMethod}.");
             if (salt.Length == 0)
             {
                 return h.ComputeHash(bytes);

Emby.Server.Implementations/Session/WebSocketController.cs

@@ -58,7 +58,7 @@ namespace Emby.Server.Implementations.Session
 
         private void OnConnectionClosed(object? sender, EventArgs e)
         {
-            var connection = sender as IWebSocketConnection ?? throw new ResourceNotFoundException(nameof(sender));
+            var connection = sender as IWebSocketConnection ?? throw new ArgumentException($"{nameof(sender)} is not of type {nameof(IWebSocketConnection)}", nameof(sender));
             _logger.LogDebug("Removing websocket from session {Session}", _session.Id);
             _sockets.Remove(connection);
             connection.Closed -= OnConnectionClosed;

Jellyfin.Api/Controllers/DynamicHlsController.cs

@@ -1348,7 +1348,7 @@ namespace Jellyfin.Api.Controllers
 
             var mapArgs = state.IsOutputVideo ? _encodingHelper.GetMapArgs(state) : string.Empty;
 
-            var directory = Path.GetDirectoryName(outputPath) ?? throw new ResourceNotFoundException(nameof(outputPath));
+            var directory = Path.GetDirectoryName(outputPath) ?? throw new ArgumentException($"Provided path ({outputPath}) is not valid.", nameof(outputPath));
 
             var outputTsArg = Path.Combine(directory, Path.GetFileNameWithoutExtension(outputPath)) + "%d" + GetSegmentFileExtension(state.Request.SegmentContainer);
 
@@ -1568,7 +1568,7 @@ namespace Jellyfin.Api.Controllers
 
         private string GetSegmentPath(StreamState state, string playlist, int index)
         {
-            var folder = Path.GetDirectoryName(playlist) ?? throw new ResourceNotFoundException(nameof(playlist));
+            var folder = Path.GetDirectoryName(playlist) ?? throw new ArgumentException($"Provided path ({playlist}) is not valid.", nameof(playlist));
             var filename = Path.GetFileNameWithoutExtension(playlist);
 
             return Path.Combine(folder, filename + index.ToString(CultureInfo.InvariantCulture) + GetSegmentFileExtension(state.Request.SegmentContainer));

Jellyfin.Api/Controllers/HlsSegmentController.cs

@@ -136,7 +136,7 @@ namespace Jellyfin.Api.Controllers
                 .FirstOrDefault(i =>
                     string.Equals(Path.GetExtension(i), ".m3u8", StringComparison.OrdinalIgnoreCase)
                     && i.IndexOf(normalizedPlaylistId, StringComparison.OrdinalIgnoreCase) != -1)
-                ?? throw new ResourceNotFoundException(nameof(transcodeFolderPath));
+                ?? throw new ResourceNotFoundException($"Provided path ({transcodeFolderPath}) is not valid.");
 
             return GetFileResult(file, playlistPath);
         }

Jellyfin.Api/Controllers/ItemLookupController.cs

@@ -342,7 +342,7 @@ namespace Jellyfin.Api.Controllers
             var ext = result.Content.Headers.ContentType.MediaType.Split('/')[^1];
             var fullCachePath = GetFullCachePath(urlHash + "." + ext);
 
-            var directory = Path.GetDirectoryName(fullCachePath) ?? throw new ResourceNotFoundException(nameof(fullCachePath));
+            var directory = Path.GetDirectoryName(fullCachePath) ?? throw new ResourceNotFoundException($"Provided path ({fullCachePath}) is not valid.");
             Directory.CreateDirectory(directory);
             using (var stream = result.Content)
             {
@@ -357,7 +357,7 @@ namespace Jellyfin.Api.Controllers
                 await stream.CopyToAsync(fileStream).ConfigureAwait(false);
             }
 
-            var pointerCacheDirectory = Path.GetDirectoryName(pointerCachePath) ?? throw new ResourceNotFoundException(nameof(pointerCachePath));
+            var pointerCacheDirectory = Path.GetDirectoryName(pointerCachePath) ?? throw new ArgumentException($"Provided path ({pointerCachePath}) is not valid.", nameof(pointerCachePath));
 
             Directory.CreateDirectory(pointerCacheDirectory);
             await System.IO.File.WriteAllTextAsync(pointerCachePath, fullCachePath).ConfigureAwait(false);

Jellyfin.Api/Controllers/RemoteImageController.cs

@@ -257,12 +257,12 @@ namespace Jellyfin.Api.Controllers
             var ext = response.Content.Headers.ContentType.MediaType.Split('/').Last();
             var fullCachePath = GetFullCachePath(urlHash + "." + ext);
 
-            var fullCacheDirectory = Path.GetDirectoryName(fullCachePath) ?? throw new ResourceNotFoundException(nameof(fullCachePath));
+            var fullCacheDirectory = Path.GetDirectoryName(fullCachePath) ?? throw new ResourceNotFoundException($"Provided path ({fullCachePath}) is not valid.");
             Directory.CreateDirectory(fullCacheDirectory);
             await using var fileStream = new FileStream(fullCachePath, FileMode.Create, FileAccess.Write, FileShare.Read, IODefaults.FileStreamBufferSize, true);
             await response.Content.CopyToAsync(fileStream).ConfigureAwait(false);
 
-            var pointerCacheDirectory = Path.GetDirectoryName(pointerCachePath) ?? throw new ResourceNotFoundException(nameof(pointerCachePath));
+            var pointerCacheDirectory = Path.GetDirectoryName(pointerCachePath) ?? throw new ArgumentException($"Provided path ({pointerCachePath}) is not valid.", nameof(pointerCachePath));
             Directory.CreateDirectory(pointerCacheDirectory);
             await System.IO.File.WriteAllTextAsync(pointerCachePath, fullCachePath, CancellationToken.None)
                 .ConfigureAwait(false);

Jellyfin.Api/Controllers/VideoHlsController.cs

@@ -362,7 +362,7 @@ namespace Jellyfin.Api.Controllers
             var threads = _encodingHelper.GetNumberOfThreads(state, _encodingOptions, videoCodec);
             var inputModifier = _encodingHelper.GetInputModifier(state, _encodingOptions);
             var format = !string.IsNullOrWhiteSpace(state.Request.SegmentContainer) ? "." + state.Request.SegmentContainer : ".ts";
-            var directory = Path.GetDirectoryName(outputPath) ?? throw new ResourceNotFoundException(nameof(outputPath));
+            var directory = Path.GetDirectoryName(outputPath) ?? throw new ArgumentException($"Provided path ({outputPath}) is not valid.", nameof(outputPath));
             var outputTsArg = Path.Combine(directory, Path.GetFileNameWithoutExtension(outputPath)) + "%d" + format;
 
             var segmentFormat = format.TrimStart('.');

Jellyfin.Api/Helpers/HlsHelpers.cs

@@ -3,7 +3,6 @@ using System.Globalization;
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
-using MediaBrowser.Common.Extensions;
 using MediaBrowser.Model.IO;
 using Microsoft.Extensions.Logging;
 
@@ -45,8 +44,12 @@ namespace Jellyfin.Api.Helpers
 
                         while (!reader.EndOfStream)
                         {
-                            var line = await reader.ReadLineAsync().ConfigureAwait(false)
-                                ?? throw new ResourceNotFoundException(nameof(reader));
+                            var line = await reader.ReadLineAsync().ConfigureAwait(false);
+                            if (line == null)
+                            {
+                                // Nothing currently in buffer.
+                                continue;
+                            }
 
                             if (line.IndexOf("#EXTINF:", StringComparison.OrdinalIgnoreCase) != -1)
                             {

Jellyfin.Api/Helpers/TranscodingJobHelper.cs

@@ -196,7 +196,7 @@ namespace Jellyfin.Api.Helpers
         /// <param name="state">The state.</param>
         private async void OnTranscodeKillTimerStopped(object? state)
         {
-            var job = state as TranscodingJobDto ?? throw new ResourceNotFoundException(nameof(state));
+            var job = state as TranscodingJobDto ?? throw new ArgumentException($"{nameof(state)} is not of type {nameof(TranscodingJobDto)}", nameof(state));
             if (!job.HasExited && job.Type != TranscodingJobType.Progressive)
             {
                 var timeSinceLastPing = (DateTime.UtcNow - job.LastPingDate).TotalMilliseconds;
@@ -489,7 +489,7 @@ namespace Jellyfin.Api.Helpers
             CancellationTokenSource cancellationTokenSource,
             string? workingDirectory = null)
         {
-            var directory = Path.GetDirectoryName(outputPath) ?? throw new ResourceNotFoundException(nameof(outputPath));
+            var directory = Path.GetDirectoryName(outputPath) ?? throw new ArgumentException($"Provided path ({outputPath}) is not valid.", nameof(outputPath));
             Directory.CreateDirectory(directory);
 
             await AcquireResources(state, cancellationTokenSource).ConfigureAwait(false);

Jellyfin.Drawing.Skia/SkiaEncoder.cs

@@ -228,7 +228,7 @@ namespace Jellyfin.Drawing.Skia
             }
 
             var tempPath = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + Path.GetExtension(path));
-            var directory = Path.GetDirectoryName(tempPath) ?? throw new ResourceNotFoundException(nameof(tempPath));
+            var directory = Path.GetDirectoryName(tempPath) ?? throw new ResourceNotFoundException($"Provided path ({tempPath}) is not valid.");
             Directory.CreateDirectory(directory);
             File.Copy(path, tempPath, true);
 
@@ -494,7 +494,7 @@ namespace Jellyfin.Drawing.Skia
             // If all we're doing is resizing then we can stop now
             if (!hasBackgroundColor && !hasForegroundColor && blur == 0 && !hasIndicator)
             {
-                var outputDirectory = Path.GetDirectoryName(outputPath) ?? throw new ResourceNotFoundException(nameof(outputPath));
+                var outputDirectory = Path.GetDirectoryName(outputPath) ?? throw new ArgumentException($"Provided path ({outputPath}) is not valid.", nameof(outputPath));
                 Directory.CreateDirectory(outputDirectory);
                 using var outputStream = new SKFileWStream(outputPath);
                 using var pixmap = new SKPixmap(new SKImageInfo(width, height), resizedBitmap.GetPixels());
@@ -542,7 +542,7 @@ namespace Jellyfin.Drawing.Skia
                 DrawIndicator(canvas, width, height, options);
             }
 
-            var directory = Path.GetDirectoryName(outputPath) ?? throw new ResourceNotFoundException(nameof(outputPath));
+            var directory = Path.GetDirectoryName(outputPath) ?? throw new ArgumentException($"Provided path ({outputPath}) is not valid.", nameof(outputPath));
             Directory.CreateDirectory(directory);
             using (var outputStream = new SKFileWStream(outputPath))
             {

Jellyfin.Server.Implementations/Users/DefaultPasswordResetProvider.cs

@@ -58,7 +58,7 @@ namespace Jellyfin.Server.Implementations.Users
                 await using (var str = File.OpenRead(resetFile))
                 {
                     spr = await JsonSerializer.DeserializeAsync<SerializablePasswordReset>(str).ConfigureAwait(false)
-                        ?? throw new ResourceNotFoundException(nameof(spr));
+                        ?? throw new ResourceNotFoundException($"Provided path ({resetFile}) is not valid.");
                 }
 
                 if (spr.ExpirationDate < DateTime.UtcNow)

MediaBrowser.LocalMetadata/Savers/BaseXmlSaver.cs

@@ -128,7 +128,7 @@ namespace MediaBrowser.LocalMetadata.Savers
 
         private void SaveToFile(Stream stream, string path)
         {
-            var directory = Path.GetDirectoryName(path) ?? throw new ResourceNotFoundException(nameof(path));
+            var directory = Path.GetDirectoryName(path) ?? throw new ArgumentException($"Provided path ({path}) is not valid.", nameof(path));
             Directory.CreateDirectory(directory);
             // On Windows, savint the file will fail if the file is hidden or readonly
             FileSystem.SetAttributes(path, false, false);