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AWS Elemental MediaLive
User Guide

Information for Embedded

Read this section if the input captions are any of the following: embedded (EIA-608 or CEA-708), embedded+SCTE-20, SCTE-20+embedded, or SCTE-20.

How Many Caption Selectors?

  • If you are doing embedded-to-embedded, create only one caption selector, even if you want to include multiple languages in the output. With this scenario, all languages are automatically extracted and are automatically included in the output.

  • If you are doing embedded-to-other, create one caption selector for each language that you want to include in the output, to a maximum of four selectors.

  • If you are doing embedded-to-embedded in some outputs and embedded-to-other in other outputs, create one caption selector for the embedded-to-embedded, then create up to four more selectors for the embedded-to-other, one for each desired language.

Caption Selector Fields

  • Selector settings:

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

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

  • EIA-608 channel number: This field specifies the language to extract. Complete as follows:

    • If you are doing embedded-to-embedded captions (you are creating only one caption selector for the input embedded captions), this field is ignored, so keep the default.

    • If you are converting embedded to another format, (you are creating several caption selectors, one for each language), specify the number of the CC instance (from the input) that holds the desired language.

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

    EIA-608 in Source

    CEA-708 in Source

    Convert Field

    Result

    Yes

    No

    Upconvert

    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

    Disabled

    Original EIA-608 is preserved.

    No

    Yes

    Upconvert

    Original CEA-708 is preserved.

    No Yes

    Disabled

    Original CEA-708 is preserved.

    Yes

    Yes

    Upconvert

    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 will not include any CEA-708 formatting features.

    Not recommended.

    Yes Yes

    Disabled

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

  • SCTE-20 detection: If the source captions combine embedded (EIA-608 or CEA-708) and SCTE-20, you might want to set this field to Auto. AWS Elemental MediaLive will give preference to the 608/708 embedded captions but will switch to use the SCTE-20 captions when necessary. If you set this field to Off, AWS Elemental MediaLive will never use the SCTE-20 captions.