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CEA/EIA-608 and CEA/EIA-708 (embedded) output captions

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CEA/EIA-608 and CEA/EIA-708 (embedded) output captions - MediaConvert
Where to specify the captionsHow to specify multiple captions tracksEmbedded and ancillary captions in MXF outputs

This section covers how to configure embedded output captions in AWS Elemental MediaConvert. The main topics include:

  • Where to specify the captions.

  • How to specify multiple captions tracks.

  • Embedded and ancillary captions in MXF outputs.

Where to specify the captions

Put your captions in the same output group and the same output as your video.

How to specify multiple captions tracks

  • If your input captions format is embedded (that is, you are passing through embedded-to-embedded), you need to create only one group of captions settings. The captions selector that you choose under Captions source includes all tracks from the input.

  • If your input captions are two SCC files, you can create output captions as two output captions channels that are embedded in your output video stream. For more information, see Converting dual SCC input files to embedded captions.

  • If your input captions are not embedded or SCC, you can include only one captions track per output. In each output, include one group of captions settings. Under Captions source, choose the selector that is set up for the track that you want to include.

Embedded and ancillary captions in MXF outputs

Whether your MXF output can contain ancillary captions depends on the MXF profile:

  • MXF XDCAM HD: This MXF profile specifies ancillary data in the smpte 436 track. With these outputs, MediaConvert copies your embedded captions to the smpte 436 ancillary track in addition to including it in the video stream.

  • MXF D-10: This MXF profile specification doesn't allow for ancillary data. Therefore, your MXF D-10 outputs only have captions embedded in the video stream.

MediaConvert determines an output's MXF profile based on the values for the following encoding settings:

  • Resolution

  • Frame rate

  • Video codec profile

  • Interlace mode

For information about which values for these settings are valid for which MXF profile, see the relevant specifications. For XDCAM HD, see RDD 9:2009 - SMPTE Standard Doc - MXF Interoperability Specification of Sony MPEG Long GOP Products in the IEEE Xplore Digital Library. For MXF D-10, see ST 356:2001 - SMPTE Standard - For Television — Type D-10 Stream Specifications — MPEG-2 4:2:2P @ ML for 525/60 and 625/50.

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