ccextractor: document importance of pipeline order for this element

diff --git a/ext/closedcaption/gstccextractor.c b/ext/closedcaption/gstccextractor.c
index d693e18..0dda4bd 100644 (file)
--- a/ext/closedcaption/gstccextractor.c
+++ b/ext/closedcaption/gstccextractor.c
@@ -21,6 +21,10 @@
 /**
  * SECTION:element-ccextractor
  * @title: ccextractor
+ * @short_description: Extract GstVideoCaptionMeta from input stream
+ *
+ * Note: This element must be added after a pipeline's decoder, otherwise closed captions may
+ * be extracted out of order.
  *
  */