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0055F - Pixel Aspect Ratio
published
0055F v2.0
Item image
PIXEL ASPECT RATIO
Pixel Width:Height
SMPTE ST 377
Expected PAR
Expected/Unexpected Values
https://qc.ebu.io/items/0055F/versions/2-0-0/
Check
Report
Summary
EBU QC Id
0055F
Name
Pixel Aspect Ratio
Status
published
Category
absolute
Lead editor
Roberto BORGOTALLO
Aliases
PAR
Tags
video
Versions
Version Status Edition date Saved by Note
Details
Definition
System shall check the presence and value of the pixel aspect ratio in the bitstream.
If not directly available the system shall compute PAR from DAR and SAR with the formula PAR= DAR / SAR.



References
Examples

  • Input: "Pixel Aspect Ratio Expected "= 16:11
    Output: "Pixel Aspect Ratio Value" = 12:11
    Output: "Pixel Aspect Ratio Readout" = true
    Output: "pixel aspect ratio" = false
    Output: human readable: "Pixel aspect ratio is 12:11.Declared Pixel aspect ratio is 12:11, while 16:11 was expected."

    Remark: Used as check plus measure

  • Input: "Pixel Aspect Ratio Expected "= 16:11
    Output: "pixel aspect ratio" = false

    Remark: Used as a simple check

  • Output: "Pixel Aspect Ratio Value" = 12:11
    Output: "Pixel Aspect Ratio Readout" = true
    Output, human readable: "Pixel aspect ratio is 12:11"

    Remark: Used as a measure (read-out)

Input parameters
Name Description
Output parameters
Name Description
Test material
Title Version Download
Remarks
Remarks
The pixel aspect ratio is the width to height ratio intended for displaying of single pixels of an image.
Pixels with PAR different from 1 (square) are used to obtain the wanted 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).
Pixel aspect ratio is metadata which can be declared in the wrapper and/or in the video format. It can also be derived with the formula PAR = DAR / SAR, when DAR and SAR are known.
User discussions
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