Embedded (CEA/EIA-608, CEA/EIA-708), SCTE-20, and Embedded+SCTE-20, and SCTE-20+Embedded - AWS Elemental Server

This is version 2.15 of the AWS Elemental Server documentation. This is the latest version. For prior versions, see the Previous Versions section of AWS Elemental Conductor File and AWS Elemental Server Documentation.

Embedded (CEA/EIA-608, CEA/EIA-708), SCTE-20, and Embedded+SCTE-20, and SCTE-20+Embedded

If your input captions are in any of the following formats, AWS Elemental Server handles them as "embedded."

  • CEA-608

  • EIA-608

  • CEA-708

  • EIA-708

If your input captions have both embedded captions and SCTE-20 captions and you want both types in your outputs, set up separate input captions selectors for the SCTE-20 and the embedded captions tracks. Set up the SCTE-20 captions selectors the same way you set up the embedded selectors.

Note

If you are extracting embedded captions from the input and using embedded captions in the output, and if the input includes VBI data and you want to include all that data in the output, then do not follow this procedure. Instead, see Extracting VBI Data Included in Embedded Input Captions.

Number of Captions Selectors for Embedded and SCTE-20 Captions

  • If all of your output captions are also an embedded format, create only one captions selector, even if you want to include multiple tracks in the output. With this setup, AWS Elemental Server automatically extracts all tracks and includes them in the output.

  • If all of your outputs are in a format that is not embedded, create one captions selector for each track that you want to include in the output.

  • If some of your outputs have captions in an embedded format and some of your outputs have captions in a different format, create one captions selector for the outputs with embedded captions. Also create individual selectors for the outputs with other captions that aren't embedded, one for each track that you want in your outputs.

Captions Selector Fields for Embedded, SCTE-20, Embedded+SCTE-20, and SCTE-20+Embedded Captions

  • Source: Specify a value for the source format as follows:

    • Choose embedded if the source captions are embedded (EIA-608 or CEA-708) or embedded+SCTE-20, or SCTE-20+embedded.

    • Choose SCTE-20 if the source captions are SCTE-20 alone.

  • CC channel number: This field specifies the track to extract. Complete as follows:

    • If you are doing embedded-to-embedded captions (that is, you create only one captions selector for the input-embedded captions), AWS Elemental Server ignores this field, so keep the default value for CC channel number.

    • If you are converting embedded captions to another format (that is, you create several captions selectors, one for each track), specify the captions channel number from the input that holds the track that you want. To do that, select the channel number from the dropdown list. For example, select 1 to choose CC1.

    Note

    AWS Elemental Server doesn't automatically detect which language is in each track (channel). You can specify that when you set up the output captions so that AWS Elemental Server passes the language code metadata for the captions channel into the output for downstream use.

  • Force 608 to 708 Upconvert: The embedded source captions may be EIA-608 captions or CEA-708 captions or both EIA-608 and CEA-708. You can specify how you want these captions to be handled when the AWS Elemental encoder is ingesting content. The following table describes the behavior for various scenarios.

    EIA-608 in Source

    CEA-708 in Source

    Upconvert Field

    Result

    Yes

    No

    Checked

    CEA-708 data is created based on the EIA-608 data and EIA-608 data is added as 608-compatibility bits in the CEA-708 data.

    Yes No

    Unchecked

    Original EIA-608 is preserved.

    No

    Yes

    Checked

    Original CEA-708 is preserved.

    No Yes

    Unchecked

    Original CEA-708 is preserved.

    Yes

    Yes

    Checked

    Not recommended.

    CEA-708 data is discarded. New CEA-708 data is created based on the EIA-608 data and EIA-608 data is added as 608-compatibility bits in the CEA-708 data.

    The new CEA-708 data does not include any CEA-708 formatting features.

    Yes Yes

    Unchecked

    Original EIA-608 is preserved and original CEA-708 is preserved.

  • Use SCTE-20 if Embedded Unavailable: This field appears only if you set the Source to “Embedded.” If the source captions combine embedded (EIA-608 or CEA-708) and SCTE-20, you may want to check this field: the encoder gives preference to the 608/708 embedded captions but switches to use the SCTE-20 captions when necessary. If you leave this field unchecked, the encoder never uses the SCTE-20 captions.