DirectShow Sample Application: Video Cropping
The CropVideo sample application
demonstrates how to configure a MontiVision DirectShow
Filter during the load process of a filter graph
configuration. The output format of some filters such as MV Rotate90 or MV Crop often depends
directly on its parameters. Configurations containing filters
like these need to be rebuilt when these "critical" parameters
change. The MV Smart Control contains various events which are called
during the load process of a project file using IMVSCFilterGraph::LoadConfig. These
events allow you to set up an event handler where you
can modify the filter parameters before the actual filter
connections are made.
This and other sample applications can
be found in the MV Development Kit installation directory.
Filter Graph Summary
The filter graph contains a live video source and the
MontiVision DirectShow filters MV Rotate90 and MV Crop. The filters are
configured during the load process of the filter graph.
This sample application contains a MV Smart Control
to display the video stream of the selected video source. On
every change of the "Rotation Angle" or "Display Window", the
application reloads the filter configuration and modifies the
filter parameters to the appropriate values.