Grass Valley Aurora Edit LD v.7.0 - Manual (Page 80)

Preserving ANC Data
Sequences created in Aurora Edit have a Preserve ANC Data checkbox that when
selected will allow ancillary data in clips sent to a Smartbin from a K2 or Summit
storage device to be preserved on the Timeline. The closed captioning present in the
ancillary data of a clip can be displayed on the SDI output of an optional AJA Breakout
Box (BOB) (LHi version only).
When incoming feeds with closed captioned data are recorded to a K2 or Summit
storage device, the K2 or Summit will put this data into an ancillary data track when
the generate ancillary data option is turned on on the K2 or Summit device. This is
done in Audio/Video configuration under Data Track Setup on the K2 or Summit.
When clips with this data are fed to an Aurora Edit Smartbin, the ancillary data can
be expected to be preserved in the clip (
Preserve ANC Data checkbox must be selected
for the sequence) and allow any closed captioning in the data track to be monitored
on the SDI output of an AJA Breakout Box (BOB) option.
The general conditions for preserving and viewing closed captioning in Aurora Edit
are listed below.
• Closed captioning data is only displayed on ancillary data tracks. Closed captioning
in the VBI will not be displayed. If a clip with closed captioning data in the VBI
is rendered (to convert to another compression type, etc.) the VBI is not preserved.
• The currently supported types of closed captioning are OP-42, OP-47, EIA-608,
and EIA-708. Data must be VANC (vertical ancillary) data; closed captioning in
the HANC (horizontal ancillary data) is not supported.
• Preservation of ancillary data is available for both SD and HD SDI video (ANC
and Line 21)
The general rules for what to expect when editing clips containing ancillary data are
listed below.
• When editing with clips with an ancillary data track on the Timeline, the data can
be expected to be preserved when the
Preserve ANC Data checkbox is selected
(when creating a new sequence).
• When edits are made on the Timeline, closed captioning in that frame can be
expected to be read and displayed without interruption.
• When effects and graphics are placed over the clips, ancillary data can be expected
to be preserved.
• When an effect involves two video tracks, such as a Resize effect with V2 over
V1, the clip that is on top (V2) ancillary data will be displayed. If the top clip does
not have an ancillary data track or valid closed captioning in the ancillary data
track, closed captioning will not be displayed regardless of the status of the clip
underneath.
• Ancillary data is not preserved over transitions (wipes, dissolves, etc.)
• Interlaced to progressive ancillary data conversions (and vice versa) are not
supported. If you have a progressive clip with closed captions on an interlaced
Timeline, the captions will not be displayed at the correct rate (they will most likely
80 Aurora Edit LD User Guide 08 April 2010
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