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

@@ -7105,7 +7105,7 @@ namespace MediaBrowser.Controller.MediaEncoding
 
         public string GetInputModifier(EncodingJobInfo state, EncodingOptions encodingOptions, string segmentContainer)
         {
-            var inputModifier = string.Empty;
+            var inputModifier = "-loglevel error";
             var analyzeDurationArgument = string.Empty;
 
             // Apply -analyzeduration as per the environment variable,