fix Start stream 3 seconds behind edge

Jellyfin.Plugin.SRFPlay/Configuration/PluginConfiguration.cs

@@ -75,6 +75,7 @@ public class PluginConfiguration : BasePluginConfiguration
         EnableCategoryFolders = true;
         EnabledTopics = new System.Collections.Generic.List<string>();
         GenerateTitleCards = true;
+        LiveStartSegmentsBack = 3;
     }
 
     /// <summary>
@@ -162,4 +163,14 @@ public class PluginConfiguration : BasePluginConfiguration
     /// Gets or sets the output directory for sport livestream recordings.
     /// </summary>
     public string RecordingOutputPath { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets how many segments back from the live edge livestream playback should start.
+    /// Injected as <c>#EXT-X-START:TIME-OFFSET=-(N * targetDuration)</c> into the live media
+    /// playlist. This keeps the start point out of the volatile live edge, which on Android TV
+    /// (ExoPlayer) otherwise causes stalling/jumping until a manual skip. RFC 8216 requires the
+    /// offset to stay at least 3 target durations from the edge, so values below 3 are clamped.
+    /// Set to 0 to disable injection entirely.
+    /// </summary>
+    public int LiveStartSegmentsBack { get; set; }
 }