no dupplicate recordings

Jellyfin.Plugin.SRFPlay/Services/RecordingService.cs

@@ -34,6 +34,7 @@ public class RecordingService : IRecordingService, IDisposable
     private readonly ConcurrentDictionary<string, Process> _activeProcesses = new();
     private static readonly JsonSerializerOptions _jsonOptions = new() { WriteIndented = true };
     private readonly SemaphoreSlim _persistLock = new(1, 1);
+    private readonly SemaphoreSlim _processLock = new(1, 1);
     private List<RecordingEntry> _recordings = new();
     private bool _loaded;
     private bool _disposed;
@@ -305,6 +306,25 @@ public class RecordingService : IRecordingService, IDisposable
 
     /// <inheritdoc />
     public async Task ProcessRecordingsAsync(CancellationToken cancellationToken)
+    {
+        // Prevent overlapping scheduler runs from spawning duplicate ffmpeg processes
+        if (!await _processLock.WaitAsync(0).ConfigureAwait(false))
+        {
+            _logger.LogDebug("ProcessRecordingsAsync already running, skipping");
+            return;
+        }
+
+        try
+        {
+            await ProcessRecordingsCoreAsync(cancellationToken).ConfigureAwait(false);
+        }
+        finally
+        {
+            _processLock.Release();
+        }
+    }
+
+    private async Task ProcessRecordingsCoreAsync(CancellationToken cancellationToken)
     {
         await LoadRecordingsAsync().ConfigureAwait(false);
 
@@ -515,6 +535,7 @@ public class RecordingService : IRecordingService, IDisposable
             }
 
             _persistLock.Dispose();
+            _processLock.Dispose();
         }
 
         _disposed = true;