0034W - Video Chroma Sub-Sampling
v3.0
published
0034W
v3.0
CHROMA SUB-SAMPLING
Subsampling
SMPTE ST 377-1
Expected Sampling Structure
Sampling Structure, Mismatch
https://qc.ebu.io/items/0034W/versions/3-0-0/
Check
Report
Summary
- EBU QC Id
- 0034W
- Name
- Video Chroma Sub-Sampling
- Status
- published
- Category
- absolute
- Lead editor
- Jerome MARTINEZ
- Aliases
- chroma sampling chroma format chroma profile pixel subsampling horizontal subsampling vertical subsampling
- Tags
- video MXF
Versions
| Version | Status | Edition date | Saved by | Note |
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Details
- Description
- Specifies ratio of luminance subsampling to chrominance subsampling.
- Definition
- Used in Checks, the system shall check if the read out chrominance sub-sampling indicated in the wrapper metadata matches the user input. Optionally the system may report the value.
Used in Reports, the system shall read out the chrominance sub-sampling from the wrapper metadata and report it. - References
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Remark: CDCI Picture Essence Descriptor, G.2.28
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- Examples
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Input: "Chroma Sub Sampling Expected" = 4:2:2
Output: "Check Result" = false
Output: "Chroma Sub Sampling" = 4:2:0
Remark: Used as a Check.
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Output:"Chroma Sub Sampling" = 4:2:0
Remark: Used as a Report.
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Input parameters
| Name | Default value | Description | Data model name | Unit | Locator |
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Output parameters
| Name | Alias | Description | Data model name | Unit | Locator |
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Test material
| Title | Version | Download |
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Remarks
- Remarks
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This card is a readout only and includes no measurement.
In case of MXF this is a combination of two metadata items: horizontal subsampling, vertical subsampling.
Horizontal subsampling 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.
User discussions
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