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2020.6

ManualsBrandsAvid Digidesign M-Audio Pinnacle Sibelius ManualsApplicationsMedia Composer
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Table Of Contents
Preserving HD Closed Captioning and Ancillary Data
927
If you want to preserve vertical blanking information, either use the 1:1 (uncompressed) resolution or
experiment with different compression ratios to make sure the captured footage or the vertical
blanking information is not unacceptably affected by the compression.
Preserving HD Closed Captioning and Ancillary Data
Unlike SD closed captioning data, which is transferred in the vertical blanking interval (VBI), HD
closed captioning and ancillary data packets are transferred in the HD-SDI data stream.
In certain circumstances, Media Composer lets you capture closed captioning and other ancillary
data in HD, preserve this data during editing, and output the data through the HD-SDI port of your
Avid input/output hardware. Media Composer lets you turn ancillary data preservation on and off and
to control which data is preserved.
Depending on your input/output hardware and the version of software you have, there are two
methods for preserving ancillary data. The Legacy method embeds the ancillary data in a DNxHD
video file, and the Data Track method adds a separate data track to the Timeline and lets you capture
and store ancillary data as a separate MXF file. You need to choose whether you want to use the new
Data Track method or the legacy embedded method.
For both methods, you can only monitor and view the data on a client monitor capable of handling
ancillary data.
Media Composer can capture and preserve any of the following types of ancillary data by default:
• Closed Captioning (CEA 608, CEA 708): Closed captioning ancillary data packets are captured
from the HD-SDI source according to the SMPTE 334M standard.
• Program Description (AFD): AFD ancillary data packets are captured from the HD-SDI source
according to the SMPTE 334M standard.
• Ancillary Time Code (ATC): Ancillary time code packets are captured from the HD-SDI source.
The options that you set for ancillary data preservation are associated with the project. When you
create a new project, you must set the ancillary data options you need for that project.
Data Track Method
The Data Track method stores ancillary data as a separate MXF file. A D (Data) track is added to
your sequence, along with the video and audio track. You can edit clips on the
D track, just as you would any other clip.
When you use the Data Track method, ancillary data preservation is subject to the following
requirements and limitations:
• You can control which types of ancillary data are captured through the Capture Settings tab in
the Media Creation tool. The data you capture is the same as the data you output.
• Four data slots are available, and the maximum size is selectable.
• To view and monitor ancillary data, you must connect an ancillary data capable device to the
output of your Avid hardware.
• You can link to XDCAM and MXF media that store ancillary data. For more information, see
“Ancillary Data and AMA” on page 930.
• You cannot add an effect to the Data track.