fix: improve recovery and auto-start flows

src/LiveRecorder.Infrastructure/Services/FfmpegService.cs

@@ -242,7 +242,7 @@ public sealed partial class FfmpegService : IFfmpegService
 
     public async Task<bool> TryReconcileInactiveSessionAsync(Guid recordSessionId, CancellationToken cancellationToken = default)
     {
-        if (IsRunning(recordSessionId) || IsSessionUnderPostProcessing(recordSessionId))
+        if (IsRunning(recordSessionId))
         {
             return false;
         }
@@ -269,11 +269,23 @@ public sealed partial class FfmpegService : IFfmpegService
             .ThenBy(static item => item.CreatedAt)
             .ToList();
 
-        var anyUsableOutput = false;
+        var anyUsableOutput = tasks.Any(static item => item.Status == RecordTaskStatus.Completed);
+        var hasBackgroundPostProcessing = false;
         string? sessionFinalizationError = null;
 
-        foreach (var task in tasks.Where(item => IsActiveTaskStatus(item.Status)))
+        foreach (var task in tasks)
         {
+            if (IsTaskUnderPostProcessing(task.Id))
+            {
+                hasBackgroundPostProcessing = true;
+                continue;
+            }
+
+            if (!IsActiveTaskStatus(task.Status))
+            {
+                continue;
+            }
+
             var durationSeconds = task.StartedAt.HasValue
                 ? (double?)Math.Max(0, (endedAt - task.StartedAt.Value).TotalSeconds)
                 : null;
@@ -299,6 +311,7 @@ public sealed partial class FfmpegService : IFfmpegService
             if (IsLowStoragePauseError(taskFinalizationError))
             {
                 task.MarkProcessing(taskFinalizationError, endedAt);
+                hasBackgroundPostProcessing = true;
             }
             else if (!string.IsNullOrWhiteSpace(taskFinalizationError))
             {
@@ -323,6 +336,12 @@ public sealed partial class FfmpegService : IFfmpegService
         {
             recordSession.MarkFailed(sessionFinalizationError, endedAt);
         }
+        else if (hasBackgroundPostProcessing)
+        {
+            recordSession.MarkStopped(
+                endedAt,
+                "Recording process was no longer running when the session was reconciled. Post-processing will continue in background.");
+        }
         else if (anyUsableOutput)
         {
             recordSession.MarkCompleted(endedAt);
@@ -594,8 +613,8 @@ public sealed partial class FfmpegService : IFfmpegService
     private void ClearPostProcessState(Guid recordTaskId) =>
         _postProcessStates.TryRemove(recordTaskId, out _);
 
-    private bool IsSessionUnderPostProcessing(Guid recordSessionId) =>
-        _postProcessStates.Values.Any(entry => entry.RecordSessionId == recordSessionId);
+    private bool IsTaskUnderPostProcessing(Guid recordTaskId) =>
+        _postProcessStates.ContainsKey(recordTaskId);
 
     private async Task<IDisposable> AcquireTranscodeSlotAsync(int maxConcurrentTasks, CancellationToken cancellationToken)
     {