Fix live tv hls playback

Jellyfin.Api/Controllers/HlsSegmentController.cs

@@ -132,13 +132,25 @@ namespace Jellyfin.Api.Controllers
 
             var normalizedPlaylistId = playlistId;
 
-            var playlistPath = _fileSystem.GetFilePaths(transcodeFolderPath)
-                .FirstOrDefault(i =>
-                    string.Equals(Path.GetExtension(i), ".m3u8", StringComparison.OrdinalIgnoreCase)
-                    && i.IndexOf(normalizedPlaylistId, StringComparison.OrdinalIgnoreCase) != -1)
-                ?? throw new ResourceNotFoundException($"Provided path ({transcodeFolderPath}) is not valid.");
+            var filePaths = _fileSystem.GetFilePaths(transcodeFolderPath);
+            // Add . to start of segment container for future use.
+            segmentContainer = segmentContainer.Insert(0, ".");
+            string? playlistPath = null;
+            foreach (var path in filePaths)
+            {
+                var pathExtension = Path.GetExtension(path);
+                if ((string.Equals(pathExtension, segmentContainer, StringComparison.OrdinalIgnoreCase)
+                     || string.Equals(pathExtension, ".m3u8", StringComparison.OrdinalIgnoreCase))
+                    && path.IndexOf(normalizedPlaylistId, StringComparison.OrdinalIgnoreCase) != -1)
+                {
+                    playlistPath = path;
+                    break;
+                }
+            }
 
-            return GetFileResult(file, playlistPath);
+            return playlistPath == null
+                ? NotFound("Hls segment not found.")
+                : GetFileResult(file, playlistPath);
         }
 
         private ActionResult GetFileResult(string path, string playlistPath)