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Chapter 7, Configuring Your MXO2 System
4 If you selected the Enable audio mapping option, for each of the MXO2
outputs, select the desired audio pair from your application.
Matrox 4VANC closed caption capture and
playback
¦NoteMatrox 4VANC closed caption is available on Matrox MXO2, MXO2
Rack, and MXO2 LE only.
If you have an SDI video source that contains digital closed caption data in the
VANC (vertical ancillary data space), MXO2’s Matrox 4VANC technology lets
you capture the closed caption data as an audio track using MXO2’s SDI input,
along with the video. The Matrox 4VANC audio track that contains the closed
caption data can then be used in a video application, such as Final Cut Pro, to
play back closed captioning through an MXO2 SDI or analog output.
The Matrox 4VANC technology preserves the SDI VANC closed caption data
during capture by encoding the data into the audio stream using audio track eight.
The resulting file is an uncompressed 24-bit 48 kHz audio file that contains the
closed caption data. You can also create a Matrox 4VANC closed caption audio
file using supported captioning software, such as CPC MacCaption. You can add
a Matrox 4VANC closed caption audio file to any project timeline in your video
application. The Matrox 4VANC audio file can also be transported and stored on
any video/audio device as an audio track.
When using MXO2’s SDI input for capture, you can choose to use audio track
eight to preserve the closed caption data that is in your source video’s VANC.
Because audio track eight is used for capturing closed captioning, that channel
will not be available for capturing audio.
¦NoteClosed caption data that is present in line 21 of a video’s VBI (vertical
blanking interval) is not transferred to an audio track because it is captured by
MXO2 as part of the video signal.
When using an MXO2 SDI or analog output for playback, you can choose to
retrieve and output the Matrox 4VANC closed caption data from your video
application. The closed caption data is retrieved from audio track eight and
output using an MXO2 SDI or analog output. When Matrox 4VANC technology
is being used, track eight is muted during playback, therefore it will not be
available for playing back audio. For playback, MXO2 lets you choose whether
to embed the closed caption data in your HD/SD video’s VANC, or in Line 21 of
the VBI portion of SD video.
The next section describes how to enable closed captioning during capture and
playback on MXO2.