Cobalt Digital COMPASS 9223 Dual-Channel 3G_HD_SD MPEG-4 Encoder - Manual (Page 39)

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9223-OM (V2.0)
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Audio Type: determines the audio type in the PMT audio descriptor. This setting has no
actual impact on how the audio is encoded; it only affects its description in the PMT.
The choices are:
o Undefined: no further information. This is the most common setting.
o Clean Effects: indicates that the audio has no language.
o Hearing Impaired: indicates that the audio is prepared for the hearing impaired.
o Visual Impaired Commentary: indicates that the audio is prepared for the
visually impaired viewer.
If the Audio Encoding setting in the Basic Tab – Audio Configuration is set to Dolby
Passthrough, another parameter becomes available in the PMT Information section:
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Dolby PMT Type: this parameter controls how Dolby AC-3 audio is signaled in the
PMT. The two choices are:
o DVB: Dolby Audio is signaled as per ETSI TS 101 154 Appendix C (stream_type
0x06 with the AC-3 Descriptor from EN 300 468 annex D).
o ATSC: Dolby Audio is signaled as per ATSC A/53 Part 3 (stream_type 0x81).
However, the 9223 is currently unable to generate the ATSC AC-3 Descriptor.
If the Output Protocol in the Encoder Connections Tab is set to RTMP, the PMT
Information fields will not be displayed as RTMP does not use the Transport
Stream container.
Audio Encoder Specific Configuration
The appearance of this control depends on the Audio Encoding setting in the Basic Tab – Audio
Configuration.
AAC-LC Configuration
MPEG-1 Layer II Configuration
The parameters are:
•
CRC: Enables/Disables CRC insertion in the audio elementary stream. This is normally
left disabled (CRC off).
•
Original/Copy: Controls the state of the Original/Copy flag in the audio elementary
stream. This setting does not affect the actual audio encoding.