update encoding log

MediaBrowser.Api/Playback/BaseStreamingService.cs

@@ -1033,7 +1033,7 @@ namespace MediaBrowser.Api.Playback
             process.BeginOutputReadLine();
 
             // Important - don't await the log task or we won't be able to kill ffmpeg when the user stops playback
-            StartStreamingLog(transcodingJob, state, process.StandardError.BaseStream, state.LogFileStream);
+            Task.Run(() => StartStreamingLog(transcodingJob, state, process.StandardError.BaseStream, state.LogFileStream));
 
             // Wait for the file to exist before proceeeding
             while (!FileSystem.FileExists(state.WaitForPath ?? outputPath) && !transcodingJob.HasExited)
@@ -1076,7 +1076,7 @@ namespace MediaBrowser.Api.Playback
             return true;
         }
 
-        private async void StartStreamingLog(TranscodingJob transcodingJob, StreamState state, Stream source, Stream target)
+        private async Task StartStreamingLog(TranscodingJob transcodingJob, StreamState state, Stream source, Stream target)
         {
             try
             {