Thompson ViBE EM4000, User Manual

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Chapter 4 ’Web Browser Interface’ — Settings
ViBE EM4000 — Release 1.10 89
User Manual — 46073586AB02
Click AAC to display the AAC audio component parameters.
Figure 4-33. Editing an audio component - AAC page
This page is used to set audio component AAC parameters when AAC
LC , HE-AAC or HE-AAC v2 has been chosen as the audio Output
Standard on the General page.
Rate Used to select audio bitrates. The bitrates available
depend on the audio encoding standard and mode.
When Standard = xx Transport , the Rate is the max
bitrate. If the transported stream has a higher bitrate, an
alarm is raised.
AD Output Stream In Audio Description encoding mode:
Adaptive : No AD packet on output when no AD input.
Always : AD packets on output even when no AD input
(null packets are generated).
Syntax Used to set the syntax of AAC encoding. Choice
between
MPEG-2 and MPEG-4 .
Packet Used to set the type of AAC encapsulation. Choice
between
ADTS (Audio Data Transport Stream) and
LOAS (Low Overhead Audio Stream) if the Syntax is
MPEG-4.
When Input Format = Dolby E , Output mode
= 5.0 or
5.1
and Output Standard = Dolby
Digital (AC3) or Dolby Digital Plus (E-AC3)
and Auto Switch mode is checked then 2
bitrate groups are proposed. In each group,
the 1st value indicates the encoding bitrate
used with a Dolby
®
E stream at input. If the
Dolby
®
E stream is replaced by a PCM 2.0
stream, then the 2nd value will be used for
encoding. See
Auto Switch Mode parameter
above.