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0069W - Display Aspect Ratio
published
0069W v4.0
Item image
DISPLAY ASPECT RATIO
Display Width:Height
Broadcaster Guidelines
Matches Guidelines
Expected/Unexpected Values
https://qc.ebu.io/items/0069W/versions/4-0-0/
Check
Report
Summary
EBU QC Id
0069W
Name
Display Aspect Ratio
Status
published
Category
absolute
Lead editor
Jerome MARTINEZ
Aliases
aspect ratio video aspect ratio ImageAspectRatio Presentation Aspect Ratio DAR
Tags
video MXF
Versions
Version Status Edition date Saved by Note
Details
Description
Display Aspect Ratio or DAR is the aspect ratio of the intended display device or screen window. It specifies the horizontal to vertical aspect ratio of the whole image as it is to be presented to avoid geometric distortion and hence including any black edges.
Definition
Used in Checks, the system shall read out the Display Aspect Ratio (DAR) indicated in the wrapper metadata and check if it matches the expected one specified in the input. Optionally the system may report the Display Aspect Ratio value.

Used in Reports, the system shall read out the Display Aspect Ratio indicated in the wrapper metadata and report it.
References
Examples

  • Input: "Display Aspect Ratio Expected" = 4:3
    Output: "Check Result" = false
    Output: "Display Aspect Ratio" = 16:9

    Remark: Used as a Check

  • Input: "Display Aspect Ratio Expected" = 4:3
    Output: "Check Result" = false
    Output: "Display Aspect Ratio" = 0:0

    Remark: Used as a Check

  • Input: None
    Output: "Display Aspect Ratio" = 16:9

    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
For MXF: this metadata element is best effort metadata. If the detected value is a Distinguished Value, the search shall be continued until a non-Distinguished Value is found. If no non-Distinguished Value is found, the Distinguished Value shall be used.

When DAR is not explicitly declared in the wrapper, the system could compute it from the height, width, and Pixel Aspect Ratio (PAR). But this should be done in a separate (measurement) Test. Also see #0055W (Latest version) .
User discussions
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