/**
* gst_video_event_parse_still_frame:
* @event: A #GstEvent to parse
- * @in_still: A boolean to receive the still-frame status from the event, or NULL
+ * @in_still: (out):
+ * A boolean to receive the still-frame status from the event, or NULL
*
* Parse a #GstEvent, identify if it is a Still Frame event, and
* return the still-frame state from the event if it is.