- EBU QC Id
- 0054W
- Name
- Origin Values
- Status
- published
- Category
- absolute
- Lead editor
- Friedrich Gierlinger
- Aliases
- precharge preload cache origin
- Tags
- MXF MXF-only
| Version | Status | Edition date | Saved by | Note |
|---|
- Description
- The Origin parameter indicates the presence of precharge.
The Origin Parameter for the File Package indicates how much stored essence exists before or after the zero point of the track.
The Origin value gives the start point along the stored essence track measured in Edit Units.
In the Material Package the Origin always shall be zero. - Definition
- In Checks, the system shall detect the Origin parameter in the MXF timeline track and compare it with the Origin expected value provided by the user. Optionally it may report the value of the Origin parameter.
In Reports, the system shall report the value of the Origin parameter. - References
-
-
Remark: MXF version 2009 or newer
-
- Examples
-
-
Input: "Origin Value Expected" = 0
Output: "Check Result" = false
Output: "Origin Value" = 5 (WrapperLocation=Source Package, Track=1)
Output: "Origin Value" = 5 (WrapperLocation=Source Package, Track=2)
Output: "Origin Value" = 5 (WrapperLocation=Source Package, Track=3)
Output: "Origin Value" = 5 (WrapperLocation=Source Package, Track=4)
Remark: Used as a Check.
-
Input: None
Output: "Origin Value" = 5 (WrapperLocation=Source Package, Track=1)
Output: "Origin Value" = 5 (WrapperLocation=Source Package, Track=2)
Output: "Origin Value" = 5 (WrapperLocation=Source Package, Track=3)
Output: "Origin Value" = 5 (WrapperLocation=Material Package, Track=1)
Remark: Used as a Report.
-
-
| Name | Default value | Description | Data model name | Unit | Locator |
|---|
| Name | Alias | Description | Data model name | Unit | Locator |
|---|
| Title | Version | Download |
|---|
- Remarks
-
Common problem: often "target systems", such as MXF file readers and transcoders, have problems with Origin values other than "0".
Examples of errors the target system may report are:
- Picture could not be detected properly as the reference picture was not found.
- Forward bottom reference field required for decoding this picture is missing.
Solution: MPEG re-encoding typically is needed, at least for the part of the frames in the precharge & rollout. Just rewrapping the files does not correct the error and is thus not sufficient.
Related SMPTE label: 060e2b34.01010102.07020103.01030000
| Title | Author | Last update |
|---|