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0002B - Analogue Frame Synchronisation Error
published
0002B v3.0
Item image
ANALOGUE FRAME SYNC
Line, Field & Frame Distortion
Applies to Storage & Transfers
Disturbance, Duration
Location, Severity
https://qc.ebu.io/items/0002B/versions/3-0-0/
Check
Report
Summary
EBU QC Id
0002B
Name
Analogue Frame Synchronisation Error
Status
published
Category
subjective
Lead editor
Peter Schallauer
Aliases
lost lock time-base corrector (TBC) hit video breakup lost video sync horizontal distortion tape damage genlock error
Tags
video
Versions
Version Status Edition date Saved by Note
Details
Description
Analogue Frame Synchronisation Errors can occur during the analogue tape replay process (e.g. during tape digitisation), as part of the analogue video transmission process or as a side-effect of improper analogue video editing. They manifest themselves in visual line or field or frame distortions where multiple adjacent lines will become distorted (often also brightened) all or part of the image will either tear horizontally or shift vertically (see examples). This can occur on a single frame or over a period of time across multiple frames. Severe Analogue Frame Sync Errors may cause the whole image to roll vertically.
Definition
Used in Checks, the system shall detect if the Frame Sync Error disturbance is beyond the specified minimum level of disturbance and if it lasts more than the specified minimum duration.
Used in Reports, the system shall report the time intervals longer than specified Minimum Duration and with Frame Sync Error disturbance beyond the minimum level. For each interval the Sync Error disturbance is reported as well .
References
Examples

  • Input: "MinimumDisturbance" = 10
    Input: "MinimumDuration" = 2 frames
    Output: "CheckResult": false
    Output: "FrameSyncError": Severity 15 from 10:00:01:10 to 10:00:01:16
    Output: "FrameSyncError": Severity 18 from 10:00:06:17 to 10:00:07:10

    Remark: Used as a Check. CheckResult = false means that at least one time interval longer than MinimumDuration and with a Frame Sync Error stronger than MinimumDisturbance was found. In this example, the output FrameSyncErrorLocation reports two segments.

  • Input: "MinimumDuration" = 3 frames
    Output: "FrameSyncError": Severity 15 from 10:00:01:10 to 10:00:01:16
    Output: "FrameSyncError": Severity 18 from 10:00:06:17 to 10:00:07:10

    Remark: Used as a Report. The system reports the time interval longer than the optional Minimum Duration and with a Frame Sync Error stronger than the optional Minimum Disturbance.

  • uploads/items/example_images/0002Bex001.jpg

  • uploads/items/example_images/0002Bex002.jpg

Input parameters
Name Default value Description Data model name Unit Locator
Output parameters
Name Alias Description Data model name Unit Locator
Test material
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Remarks
Remarks
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