Enables or disables read-ahead in a media source.
|Data type||PROPVARIANT type (vt)||PROPVARIANT member|
Applications can use this property to configure some media sources. To set the property, pass an IPropertyStore pointer to the source resolver. For more information, see Configuring a Media Source.
If the value is VARIANT_TRUE, the media source will not read ahead in the byte stream. This setting can optimize performance if you plan to read a limited amount of data from the media source—for example, to get a thumbnail image from a video file.
For typical audio/video playback, this property should be set to VARIANT_FALSE. The default value is VARIANT_FALSE.
Not every media source supports this property.