Channel mapping – Grass Valley iTX System v.2.6 User Manual
Page 208
Configuring the audio output for a playout channel
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The content of the first source channel to the left output channel; the content of the
other source channels, in order, to the right, centre, LFE, left-surround and right-
surround output channels.
Channel mapping
Source media may contain a number of alternative audio tracks for use in different situations.
For instance, a media file for a movie may have a number of foreign-language tracks to cater
for playout requirements in different countries. iTX can select any particular channel by using
channel-mapping functionality. You configure this functionality in the Audio Mapping panel.
For channel mapping of a media file or live video feed, you may identify a source track in the
following:
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By a tag with which the track is labelled. Foreign-language tracks in a media file often
have standard 2- or 3-letter tags assigned to them in a post-production process; e.g.
ENG, FRA, SPA for English, French and Spanish.
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By a group number. This indicates the position of the track in the source media; also, a
relationship (for output purposes) between any tracks with the same group number.
Tracks may have group numbers 0 to 15.
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By assigning a default group. This indicates the group to use, if no tag or group can be
determined.
In the Audio Mapping panel, you select track tags in the Language boxes:
You may specify a group of tags, listed in order of preference. This instructs iTX to select an
alternative track for the output when the preferred track is not available (e.g. to play out an
English track when a Spanish track is not available).
In some systems, tags may include an extra character after the main part of the tag. For
instance, ENGL and ENGR may identify the left (L) and right (R) channels of an English (ENG)
stereo track. iTX allows a tag to end with any such character without it affecting search results.
So it treats the tracks with ENGL and ENGR tags the same as tracks with the ENG tag when
searching for tracks with a specific tag.
You select group numbers in the Group boxes:
March 2015
System Administrator Guide
Page 208 of 404