Pixel aspect ratio for a video media type.

Data type



The upper 32 bits contain the numerator of the pixel aspect ratio and the lower 32 bits contain the denominator. The numerator is the horizontal component of the aspect ratio; the denominator is the vertical component.

To set this attribute, use the MFSetAttributeRatio function. To get this attribute, use the MFGetAttributeRatio function.

The pixel aspect ratio describes the shape of the pixels in the displayed video image. Set this attribute if the image has non-square pixels. To display correctly on a display device with square pixels, the image must be scaled by the inverse of the image's pixel aspect ratio.

The GUID constant for this attribute is exported from mfuuid.lib.


Minimum supported client

Windows Vista [desktop apps | Windows Store apps]

Minimum supported server

Windows Server 2008 [desktop apps | Windows Store apps]



See also

Alphabetical List of Media Foundation Attributes
Media Type Attributes
Media Foundation Attributes
Picture Aspect Ratio