update logging

MediaBrowser.Api/Playback/BaseStreamingService.cs

@@ -995,7 +995,17 @@ namespace MediaBrowser.Api.Playback
             var commandLineLogMessage = process.StartInfo.FileName + " " + process.StartInfo.Arguments;
             Logger.Info(commandLineLogMessage);
 
-            var logFilePath = Path.Combine(ServerConfigurationManager.ApplicationPaths.LogDirectoryPath, "transcode-" + Guid.NewGuid() + ".txt");
+            var logFilePrefix = "transcode";
+            if (state.VideoRequest != null && string.Equals(state.OutputVideoCodec, "copy", StringComparison.OrdinalIgnoreCase) && string.Equals(state.OutputAudioCodec, "copy", StringComparison.OrdinalIgnoreCase))
+            {
+                logFilePrefix = "directstream";
+            }
+            else if (state.VideoRequest != null && string.Equals(state.OutputVideoCodec, "copy", StringComparison.OrdinalIgnoreCase))
+            {
+                logFilePrefix = "remux";
+            }
+
+            var logFilePath = Path.Combine(ServerConfigurationManager.ApplicationPaths.LogDirectoryPath, logFilePrefix + "-" + Guid.NewGuid() + ".txt");
             FileSystem.CreateDirectory(Path.GetDirectoryName(logFilePath));
 
             // FFMpeg writes debug/error info to stderr. This is useful when debugging so let's put it in the log directory.