---
title: Pixel Aspect Ratio Extension Constants
framework: coremedia
role: collectionGroup
role_heading: API Collection
path: coremedia/pixel-aspect-ratio-extension-constants
---

# Pixel Aspect Ratio Extension Constants

Constants that identify pixel aspect ratio extensions.

## Topics

### Constants

- [kCMFormatDescriptionKey_PixelAspectRatioHorizontalSpacing](coremedia/kcmformatdescriptionkey_pixelaspectratiohorizontalspacing-swift.var.md)
- [kCMFormatDescriptionKey_PixelAspectRatioVerticalSpacing](coremedia/kcmformatdescriptionkey_pixelaspectratioverticalspacing-swift.var.md)

## See Also

### Constants

- [Audio Format Description Mask Codes](coremedia/audio-format-desc-codes.md)
- [Chroma Location Extension Constants](coremedia/chroma-location-extension-constants.md)
- [Clean Aperture Extension Constants](coremedia/clean-aperture-extension-constants.md)
- [Closed Caption Format Type Constants](coremedia/closed-caption-formats.md)
- [Color Primary Extension Constants](coremedia/color-primary-extension-constants.md)
- [Field Detail Extension Constants](coremedia/field-detail-extension-constants.md)
- [Format Description Bridge Error Codes](coremedia/format-description-bridge-errors.md)
- [Format Description Constants](coremedia/format-description-constants.md)
- [Format Description Error Codes](coremedia/format-description-errors.md)
- [HEVC Temporal Level Info Constants](coremedia/hevc-temporal-level-info-constants.md)
- [Metadata Format Description Constants](coremedia/metadata-format-description-constants.md)
- [MPEG-2-conformant Formats](coremedia/mpeg-2-conformant-formats.md)
- [Text Display Flags](coremedia/text-display-flags.md)
- [Text Format Constants](coremedia/text-format-constants.md)
- [Text Format Description Constants](coremedia/text-format-description-constants.md)