Reduce FFmpeg log verbosity and add client info to error logs

- Set FFmpeg loglevel to 'error' to suppress repetitive warnings like 'Skipping NAL unit'
- Add client IP and User-Agent to exception middleware logging for better debugging

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -7172,7 +7172,7 @@ namespace MediaBrowser.Controller.MediaEncoding
 
         public string GetInputModifier(EncodingJobInfo state, EncodingOptions encodingOptions, string segmentContainer)
         {
-            var inputModifier = string.Empty;
+            var inputModifier = "-loglevel error";
             var analyzeDurationArgument = GetFfmpegAnalyzeDurationArg(state);
 
             if (!string.IsNullOrEmpty(analyzeDurationArgument))