language: en
tags:
- Video
+description: >
+ Apply one or more filters to a region of the video image. The region can be
+ shaped as well using the alpha channel of another producer.
+bugs: "circle" is unpredictable in the absence of the librsvg pixbuf loader.
+parameters:
+ - identifier: argument
+ title: File
+ type: string
+ description: >
+ A file whose alpha channel will "shape" the region. The string "circle"
+ is a shortcut but it requires pixbuf with the librsvg loader. The circle
+ is automatically stretched to the region to create an ellipse.
+ - identifier: region.*
+ title: Region
+ description: >
+ Properties may be set on the encapsulated region transition.See "region"
+ transition for details.