* turns out raw DV files can have .dif extension

Originally committed as revision 2921 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/dv.c

@@ -921,7 +921,7 @@ static AVInputFormat dv_iformat = {
     dv_read_packet,
     dv_read_close,
     dv_read_seek,
-    .extensions = "dv",
+    .extensions = "dv,dif",
 };
 
 static AVOutputFormat dv_oformat = {