Audio Modes
Page E-8
Reference Guide: EN8000 MPEG-4 PArt 10 (H.264/AVC) Encoders
ST.RE.E10233.1
Digital Audio
AE
S/EBU)
Pre
-
encoded
Bit
-
stream
Linear
PCM
SA
AA
Internal
Coding
MPEG
-
1
Layer II
HE
AAC
Internal
Coding
SA
Synchronised
Audio
AAC
Figure E.3: Digital / SDI Embedded Audio Route
Serial Digital Interface Embedded Audio
Audio can be embedded on a serial digital interface (SDI) feed within 4 groups. Each group
contains two stereo pairs. Hence each SDI can carry a maximum of 2 x 4 = 8 stereo pairs, or
16 mono channels.
Each group has an associated Data Identifier (DID). The standard DIDs are typically:
•
Group 1 = 0x2FF
•
Group 2 = 0x1FD
•
Group 3 = 0x1FB
•
Group 4 = 0x2F9
The DIDs are located in ancillary packets in the data stream. Other DIDs are possible. DID
1F4 is reserved for EDH error packets. Refer to the SMPTE 272M specification for more
details.
Input Selection
shows how the encoder routes the embedded audio, in conjunction with the
chosen DID.
Содержание EN8000
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