videotimecode: Allow 24000/1001 frame rate

https://bugzilla.gnome.org/show_bug.cgi?id=796107
diff --git a/gst-libs/gst/video/gstvideotimecode.c b/gst-libs/gst/video/gstvideotimecode.c
index 01026f8..e795578 100644
--- a/gst-libs/gst/video/gstvideotimecode.c
+++ b/gst-libs/gst/video/gstvideotimecode.c
@@ -79,7 +79,8 @@
   if (tc->frames >= fr && (tc->config.fps_n != 0 || tc->config.fps_d != 1))
     return FALSE;
   if (tc->config.fps_d == 1001) {
-    if (tc->config.fps_n != 30000 && tc->config.fps_n != 60000)
+    if (tc->config.fps_n != 30000 && tc->config.fps_n != 60000 &&
+        tc->config.fps_n != 24000)
       return FALSE;
   } else if (tc->config.fps_n % tc->config.fps_d != 0) {
     return FALSE;