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Please consider these points while configuring a Playout of OP-47 subtitles.

We support devices from AJA and BMD for OP-47 playout.
AJA supports only a single output to carry OP-47 data. Which output this is depends on the video device and the switch to live method used for the channel.
The output of OP-47 data is currently not supported for channels set up to play out fill and key using a device from BMD.
To be able to pass through OP-47 data embedded into the Live Signal, an AJA Io 4K Plus, Io X3, KONA 4 or KONA 5 is needed or a "4K" device from BMD.
We support OP-47 teletext subtitles embedded in a MXF data track.
We support OP-47 teletext subtitles in a EBU-STL or SRT sidecar file (BMD devices ONLY)

We have been testing OP-47 support ONLY using PAL 1920x1080 HD channels.
AJA currently does not support OP-47 sidecar files. Please use a device from BMD for the time being.

Configuration of playout of EBU-STL and SRT sidecars can be found in the “Advanced” tab of a channel’s settings.