0055W - Pixel Aspect Ratio
Summary
EBU QC Id
0055W
Name
Pixel Aspect Ratio
Status
published
Category
absolute
Lead editor
Malateshgouda Karegoudar
Aliases
PAR
Tags
video MXF
Versions
Version Status Edition date Saved by Note
Details
Description
The pixel aspect ratio is the width to height ratio of each single pixel of an image.

Pixels with a PAR different from 1:1 (square) can be used to obtain the desired Display Aspect Ratio (DAR, which the ratio of the projected images) from a different Stored Aspect Ratio (SAR, which is the ratio of the stored pixel resolution).
Definition
Used in Checks, the system shall calculate the PAR based on the wrapper metadata and check if it matches the expected one specified in the input. Optionally, the system may report the value.

Used in Reports, the system shall calculate the PAR based on the wrapper and report it.

References
Examples
  • Input: "Pixel Aspect Ratio Expected "= 16:11
    Output: "Check Result" = false
    Output: "Pixel Aspect Ratio" = 12:11

    Remark: Used as a Check.


  • Output: "Pixel Aspect Ratio" = 1:1

    Remark: Used as a Report.

Input parameters
Name Default value Description Data model name Unit Locator
Output parameters
Name Alias Description Data model name Unit Locator
Test material
Title Version Download
Remarks
Remarks
The PAR can be read from the metadata, when it is not available directly, the pixel aspect ratio can be derived with the formula PAR = DAR / SAR, when DAR and SAR are known. SAR values (Display Height / Display Width), as well as DAR (aspect ratio value in MXF) shall be read-out from the MXF wrapper metadata.
User discussions
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