Handling Persistent Properties

All properties set through the IBasicVideo and IVideoWindow interfaces are meant to be persistent across connections. Therefore, disconnecting and reconnecting a renderer should show no effects on the window size, position, or styles. However, if the video dimensions change between connections, the renderer should reset the source and destination rectangles to their defaults. The source and destination positions are set through the IBasicVideo interface.

Both IBasicVideo and IVideoWindow provide enough access to properties to allow an application to save and restore all the data in the interface in a persistent format. This will be useful to applications that must save the exact configuration and properties of filter graphs during an editing session and restore them later.