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  "title" : "Supported Property Dictionary Constants"
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# Supported Property Dictionary Constants

Property dictionary key and constant values.

## Discussion

Property dictionary key and constant values for a dictionary populated by [`VTSessionCopySupportedPropertyDictionary(_:supportedPropertyDictionaryOut:)`](/documentation/VideoToolbox/VTSessionCopySupportedPropertyDictionary(_:supportedPropertyDictionaryOut:)).

## Topics

### Properties

[`let kVTPropertyTypeKey: CFString`](/documentation/VideoToolbox/kVTPropertyTypeKey)

Dictionary key used to access the property type.

[Property Type Constants](/documentation/VideoToolbox/property-type-constants)

Supported constant values for `kVTPropertyTypeKey`.

[`let kVTPropertyReadWriteStatusKey: CFString`](/documentation/VideoToolbox/kVTPropertyReadWriteStatusKey)

Dictionary key to access the read/write status of a property.

[Read/Write Status Constants](/documentation/VideoToolbox/read-write-status-constants)

Supported constant values for `kVTPropertyReadWriteStatusKey`.

[`let kVTPropertyShouldBeSerializedKey: CFString`](/documentation/VideoToolbox/kVTPropertyShouldBeSerializedKey)

Dictionary key to access the serializable status of a property.

[`let kVTPropertySupportedValueListKey: CFString`](/documentation/VideoToolbox/kVTPropertySupportedValueListKey)

Dictionary key to access the array of of supported values.

[`let kVTPropertySupportedValueMaximumKey: CFString`](/documentation/VideoToolbox/kVTPropertySupportedValueMaximumKey)

Dictionary key to access the maximum value of a property.

[`let kVTPropertySupportedValueMinimumKey: CFString`](/documentation/VideoToolbox/kVTPropertySupportedValueMinimumKey)

Dictionary key to access the minimum value of a property.

[`let kVTPropertyDocumentationKey: CFString`](/documentation/VideoToolbox/kVTPropertyDocumentationKey)

Dictionary key to access any documentation intended for developers only.


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