Index: OpenSceneGraph/trunk/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp
===================================================================
--- OpenSceneGraph/trunk/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp (revision 9885)
+++ OpenSceneGraph/trunk/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp (revision 9965)
@@ -37,5 +37,6 @@
         supportsExtension("mpg", "Mpeg movie format");
         supportsExtension("mpv", "Mpeg movie format");
-        supportsExtension("wmv", "");
+        supportsExtension("wmv", "Windows Media Video format");
+        supportsExtension("mkv", "Matroska");
 
         // Register all FFmpeg formats/codecs