AVMetadataID3MetadataKeyRelativeVolumeAdjustment

objc2_av_foundation

Static AVMetadataID3MetadataKeyRelativeVolumeAdjustment 

Source 
pub unsafe static AVMetadataID3MetadataKeyRelativeVolumeAdjustment: Option<&'static AVMetadataKey>
Available on crate feature AVMetadataFormat only.
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Apple’s documentation