Grass Valley iTX System v.2.6 - Manual (Page 213)

Configuring the audio output for a playout channel
The Mapping XML section shows the channel is configured for the output of one track of PCM
Stereo (audio type 5), with Italian content; the output track starts on pin 1 (channel 1).
The Clip Track Info section lists all the tracks in the selected media file. There are 8 tracks (or
streams), each containing one channel.
The Mapping section shows how iTX is to play out the file in the current channel: two Italian
source tracks (tracks 0 and 1) to the first PCM stereo output track (output 0).
The Final Output Mapping XML section shows how the source tracks are distributed across the
channels in the PCM stereo output track: track 0 (or stream 0) on the first channel (pin 1); track
1, (or stream 1) on the second channel (pin 2).
Clip mapping
To ensure a consistent audio output when there are variations in the number of audio tracks,
or their types, in source media files, you should specify the required output type in the Audio
Mapping panel.
However, where the audio properties of all source media files are the same, you may set up iTX
to play out the audio content exactly as it is in the source media. So, for example, iTX then
outputs two PCM stereo tracks when the media contains two PCM stereo tracks; or an AC-3
track when the media contains an AC-3 track.
We call this type of configuration clip mapping. You set it up by clearing all entries under the
Media tab in the Audio Mapping panel.
You should only use clip mapping where all media files contain PCM audio tracks, or where all
assets have the same audio configuration. You should not use it where there is a mixture of
source audio formats that include Dolby Digital or Dolby E.
Note: Mapping of audio streams is not permitted on ‘live’ event inputs – for example, if tracks 1
and 2 are a PCM stereo pair in the live source, they cannot be duplicated or moved to tracks 3
and 4 on play out.
Using the Audio Mapping panel
You use the Audio Mapping panel to specify the number, format and channel-mapping of audio
tracks in the SDI output signal. Through this panel, you may:
• Add an audio track to the output of a playout channel.
• Remove an audio track from the output of a playout channel.
• Configure the output audio tracks for a playout channel.
• View the XML code for the channel mapping of an audio track.
March 2015 System Administrator Guide Page 213 of 404