Rules for converting source captions to output captions - AWS Elemental Live

Rules for converting source captions to output captions

This section helps you to ensure that when creating an event or profile, you select a format that is valid for your output captions.

Various constraints exist for the caption formats that you can include in your content:

  • For a given input container, Elemental Live can parse certain caption formats.

  • For a given input caption format, Elemental Live can create one or more output captions. However, a given output caption can appear only in specific output containers.

In summary – starting with the output container you want to produce:

  • A given output container supports a given set of output caption formats. This container constrains your choice of output captions.

  • Furthermore, to produce each output caption format, you must use one of the compatible input caption formats .And you must select an input which can appear in the input container you have selected. So both which original input container and format you choose constrains your choice of output caption formats.

You must determine if it's possible for you to include the captions format that you want in your output. For example, assume that you want to include WebVTT captions in an HLS output. Assume that your captions source is in an MP4 container.You can implement this use case only if the MP4 container holds 608 embedded captions. You can't implement if, for example, the MP4 container holds ancillary captions.

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