pub unsafe static AVMediaCharacteristicContainsAlphaChannel: Option<&'static AVMediaCharacteristic>Available on crate feature
AVMediaFormat only.Expand description
A media characteristic that indicates that a track contains an alpha channel.
To determine whether alpha is straight or pre-multiplied, look for the format description extension with key kCMFormatDescriptionExtension_AlphaChannelMode.
See also Apple’s documentation