[rygel] Added a comment

[Murray Cumming <murrayc src gnome org>]

commit 3dc2e9f211dbb07602167b18f55f5197cda6e1dd
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Jan 7 14:11:16 2013 +0100

    Added a comment

 .../gstreamer/rygel-gst-media-engine.vala          |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/src/media-engines/gstreamer/rygel-gst-media-engine.vala b/src/media-engines/gstreamer/rygel-gst-media-engine.vala
index f2555df..bc4a5a3 100644
--- a/src/media-engines/gstreamer/rygel-gst-media-engine.vala
+++ b/src/media-engines/gstreamer/rygel-gst-media-engine.vala
@@ -62,6 +62,11 @@ public class Rygel.GstMediaEngine : Rygel.MediaEngine {
         var transcoding = true;
         var transcoder_list = new ArrayList<string> ();
 
+        /* Allow some transcoders to be disabled by the Rygel Server configuration.
+         * For instance, some DLNA Renderers might incorrectly prefer inferior transcoded formats,
+         * sometimes even preferring transcoded formats over the original data,
+         * so this forces them to use other formats.
+         */
         var config = MetaConfig.get_default ();
         try {
             transcoding = config.get_transcoding ();