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0039B - Digital Tape Dropouts
published
0039B v3.0
Item image
DIGITAL TAPE DROPOUTS
Tape Errors
Tape Type Dependent
Area of Image Affected
Area, Duration
https://qc.ebu.io/items/0039B/versions/3-0-0/
Check
Report
Summary
EBU QC Id
0039B
Name
Digital Tape Dropouts
Status
published
Category
subjective
Lead editor
Peter Schallauer
Aliases
digital video tape dropout digital hits digital tape hits
Tags
video
Versions
Version Status Edition date Saved by Note
Details
Description
Digital video tape dropouts are visible artefacts which occur within the digital tape read process and manifest themselves when head problems or tape overuse cause the error correction of the VTR to create short term failures for parts of frames.

The visual effect is the appearance of impairments, such as alternating lines in a block, duplicated block areas, arrays of pixels within a block area, and random portions of blocks with changed luminance or chrominance within one or multiple consecutive frames.

The appearance of those blocks as well as their spatiotemporal pattern strongly depends on the kind of tape, such as Digi-BETA, IMX, HDCAM, DV, D1, D2, D3 and D5.
Definition
Used in Checks, the system shall check for the presence of visible artefacts caused by digital tape or player errors. Optionally the system may report the total area and the total duration of the artefacts in the video.

Used in Reports, the system shall report the total area and the total duration of the artefacts in the video.
References
Examples

  • Input: "Minimum Area" = 0.4%
    Output: "Check Result" = false
    Output: "Dropout Area Segment" = 00:00:00:23 - 00:00:00:23 Area: 0.7%
    Output: "Dropout Area Segment" = 00:00:10:04 - 00:00:10:07 Area: 0.5%
    Output: "Total Duration" = 200 ms

    Remark: Used as a Check

  • Output: "Dropout Area Segment" = 00:00:00:23 - 00:00:00:23 Area: 0.7%
    Output: "Dropout Area Segment" = 00:00:10:04 - 00:00:10:07 Area: 0.5%
    Output: "Dropout Area Segment" = 00:00:15:10 - 00:00:15:16 Area: 0.3%
    Output: "Total Duration" = 480 ms

    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
User discussions
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