A core media video format description object that defines the video format.
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
Setting this property will allow the output settings assistant to make a more informed recommendation for the video settings that should be used. After setting this property, you should re-query the
video property to get the new recommendation. The default value is
NULL, which means that the output settings assistant does not know anything about the format of your video data.
When setting a non-
NULL value for this property and using the output settings assistant to initialize an
AVAsset instance, the same format description should be used to initialize the
AVAsset, along with the dictionary from the