2.10 608 and 708 Closed Captions (v2.5)

Owned by Thomas Staiger
Last updated: Jun 25, 2020
2 min read

Please consider these points while configuring a Playout of Closed Captions.

  • We only support devices from AJA for CC playout.
  • To be able to pass through CC data embedded into the Live Signal, an AJA Kona 4 is needed.
  • CC of the Live Signal may be on lines 9 through 20. The incoming signal is automatically scanned for caption data.
  • Playing out QuickTime MOV Videos, line-21 burn-in, the CC data track as well as MCC and SCC sidecar files are supported for Closed Captions.
  • When playing out MXF Videos, sidecar files in both SCC and MCC formats are now supported for Closed Captions. This includes files written by just:in.
  • When both a sidecar file and QuickTime/XDCAM CC data track are available for a Video, the sidecar file will be used.
  • When playing out NTSC HD with Closed Captions enabled just:out always sends CEA-708 CC packets. For media with CEA-608 CC packets these will be wrapped into CEA-708 CC packets.
  • When playing out NTSC SD with Closed Captions enabled just:out now always sends CEA-608 CC packets. For media with CEA-708 CC packets these will be wrapped into CEA-608 CC packets whenever possible.
  • Using the Jump to Next function can take some seconds before the captions will be cleared on screen.
  • CEA-608 and CEA-708Closed Captions can be added directly to the outgoing RTMP stream. Please verify with your CDN that CC are supported.


  • To allow the AJA device to add VANC data to the outgoing video signal, the checkbox in front of the VANC option has to be activated under the Video Setup tab of the AJA Control Panel.
  • To enable the hardware to pass through CC data from the Live Source of an HD Channel, activate the 4K Firmware of the AJA Kona 4 card and select a Non DSK mode in just:connect,
  • CC data is only supported while using a Non DSK or Disabled Live SDI input configuration in the channel settings of just:connect. Selecting a DSK-based method will disable the Playout of Closed Captions completely.
  • The output of Closed Captions of an UHD/4K channel is not supported at the moment.

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