Cobalt Co9992-4ENC-4K-HEVC Software-Defined Broadcast Encoder - Manual (Page 50)

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Closed Captioning (CC)
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Active Format Description (AFD)

SCTE 104 Ad Insertion Triggers (which are converted to SCTE 35 messages)

HDR Metadata, carried over SMPTE 2108 ancillary data packets

Any other generic ancillary data types, which are inserted using SMPTE-2038
Closed Captioning
The Closed Captioning controls are as follows:

Enable CC: Check this box to enable Closed-Captioning insertion. Closed Captions are
inserted in the video elementary stream, as per ATSC A/72. Both CEA-608 and
CEA-708 captions are supported. Once this box is checked, additional controls are
displayed:

CC Source: This controls where the encoder extracts closed captions. The options are:
o SMPTE-334 VANC : The encoder extracts CC information from ancillary data
packets. Both CEA-608 and CEA-708 modes are supported (and automatically
detected).
o CEA-608 Line 21 : This option is only effective if the input is SD. The encoder
will extract all the CEA-608 information from both fields of Line 21, if present.
If the input is not SD, the encoder will always look for CC ancillary data packets.

Allowed CC Types: SMPTE-334M specifies two types of Closed-Captioning
information in the VANC:
o EIA-708 captions on DID 0x161, SDID 0x101
o EIA-608 captions on DID 0x161, SDID 0x102
This control has the following settings:

Both SMPTE-334 608 and 708: the encoder will accept and process either format.
However, note that if both formats are present, the captions will be inserted twice.