support colon-separated rates patch by Roine Gustafsson <roine AT users DOT sourceforge DOT net>

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@3892 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/utils.c

@@ -2487,6 +2487,8 @@ int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg)
 
     /* Then, we try to parse it as fraction */
     cp = strchr(arg, '/');
+    if (!cp)
+        cp = strchr(arg, ':');
     if (cp) {
         char* cpp;
 	*frame_rate = strtol(arg, &cpp, 10);