0223W - Vertical Subsampling
Summary
EBU QC Id
0223W
Name
Vertical Subsampling
Status
published
Category
absolute
Lead editor
Jens SCHNEEWEISS
Aliases
V-Subsampling Vertical Sub Sampling
Tags
video MXF MXF-only
Versions
Version Status Edition date Saved by Note
Details
Description
Specifies the ratio of luminance subsampling to colour difference subsampling (e.g. 4:4:4, 4:2:2, 4:2:0) in the vertical direction.

In MXF this works together with the metadata element "Horizontal Subsampling", see: [EBU QC Test Item 0222W https://ebu.io/qc/items/0222W].
Definition
Used in Checks, the system shall read out the value indicated in 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 read out the value indicated in the wrapper metadata and report it.
References
  • SMPTE ST 377-1

    Remark: MXF, G.2.28 Vertical Subsampling

  • User profiles

    Remark: E.g. the ARD-ZDF profiles

Examples
  • Input: "Subsampling Expected" = 1
    Output: "CheckResult" = True
    Output: "Vertical Subsampling" = 1
    Output: "Vertical Subsampling Text" = 4:4:4 or 4:2:2 or 4:1:1

    Remark: Used as a Check


  • Input: none
    Output: "Vertical Subsampling" = 2

    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
This item is a Read Out only and includes no Measurement.
User discussions
Title Author Last update