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# Tag Values

## Topics

### Media Type

Values for use with the tag media type category.

[`extern const CMTag kCMTagMediaTypeVideo;`](/documentation/CoreMedia/kCMTagMediaTypeVideo)

A value for associating a tag’s media type with video.

[`extern const CMTag kCMTagMediaTypeAudio;`](/documentation/CoreMedia/kCMTagMediaTypeAudio)

A value for associating a tag’s media type with audio.

[`extern const CMTag kCMTagMediaTypeMetadata;`](/documentation/CoreMedia/kCMTagMediaTypeMetadata)

A value for associating a tag’s media type with metadata.

### Media Subtype

Values for use with the tag media subtype category.

[`extern const CMTag kCMTagMediaSubTypeMebx;`](/documentation/CoreMedia/kCMTagMediaSubTypeMebx)

### Frame Arrangements

Values for use with the tag frame-packing information category.

[`extern const CMTag kCMTagPackingTypeNone;`](/documentation/CoreMedia/kCMTagPackingTypeNone)

A frame-packing tag value for video without packed frames.

[`extern const CMTag kCMTagPackingTypeSideBySide;`](/documentation/CoreMedia/kCMTagPackingTypeSideBySide)

A tag stating that associated video has packed frames with a left eye image on the left and right eye image on the right.

[`extern const CMTag kCMTagPackingTypeOverUnder;`](/documentation/CoreMedia/kCMTagPackingTypeOverUnder)

A tag stating that associated video has packed frames with a left eye image on the top and right eye image on the bottom.

### Projection Surfaces

Values for use with the tag projection type category.

[`extern const CMTag kCMTagProjectionTypeRectangular;`](/documentation/CoreMedia/kCMTagProjectionTypeRectangular)

A value for projection tags indicating that display is on a flat rectangular surface.

[`extern const CMTag kCMTagProjectionTypeEquirectangular;`](/documentation/CoreMedia/kCMTagProjectionTypeEquirectangular)

A value for projection tags indicating that display is on a 360 degree equirectangular projection.

[`extern const CMTag kCMTagProjectionTypeFisheye;`](/documentation/CoreMedia/kCMTagProjectionTypeFisheye)

Video content displays as a fisheye projection.

### 3D Video Data

Values for use with the tag categories that provide stereo video metadata.

[`extern const CMTag kCMTagStereoInterpretationOrderReversed;`](/documentation/CoreMedia/kCMTagStereoInterpretationOrderReversed)

A value for a stereo interpretation tag indicating the video data for the left and right eyes are reversed.

[`extern const CMTag kCMTagStereoLeftAndRightEye;`](/documentation/CoreMedia/kCMTagStereoLeftAndRightEye)

A value for a stereo tag indicating the video track has left and right eye layers.

[`extern const CMTag kCMTagStereoLeftEye;`](/documentation/CoreMedia/kCMTagStereoLeftEye)

A value for a stereo tag indicating the video track has a left eye layer.

[`extern const CMTag kCMTagStereoRightEye;`](/documentation/CoreMedia/kCMTagStereoRightEye)

A value for a stereo tag indicating the video track has a right eye layer.

[`extern const CMTag kCMTagStereoNone;`](/documentation/CoreMedia/kCMTagStereoNone)

A value for a stereo tag indicating the video track has no eye layer data.


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