Small Patch for "ffplay -" instead of "ffplay pipe:" by (Bill Eldridge <bill at rfa dot org>)

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@2181 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffplay.c

@@ -1660,6 +1660,8 @@ void show_help(void)
 
 void parse_arg_file(const char *filename)
 {
+    if (!strcmp(filename, "-"))
+                    filename = "pipe:";
     input_filename = filename;
 }