Regardless how you plan to insert real-time closed captioning to live video using one of the workflows mentioned in this article, the channel need to be configured the proper way. There are 3 preset options for the channel, visible under the channel preview player:
- "I don't use closed captioning".
- "Closed captioning is in the video".
- "Closed captioning is not in the video".
The selection of either option will change the RTMP path you need to copy to an RTMP encoder. The image below shows where to find these settings.
What Each Option Does?
"I don't use closed captioning" - means you don't use closed captioning and no further changes are needed.
"Closed captioning is in the video" - check this box when closed captioning are already inserted to the video. If you have a hardware closed captioning decoder (example decoders by Evertz, EEG etc), a stenograph operator sends captions data to the device, captions are embedded in the SDI video and go out to a media encoder? Check this box.
"Closed captioning is not in the video" - check this box when a remote stenograph operator listen to your broadcast and creates closed captioning that are sent to Videolinq separately from the video, Videolinq receives the video from your encoder and the captions from the stenograph operator (via 3rd party partners).
Checkbox selections affect the Encoder RTMP path. The default is option 1 ("I don't use closed captioning"). After making a closed captions selection, copy the RTMP path and stream key to your RTMP encoder as shown in the image below.
IMPORTANT: Always send to Videolinq the RTMP video before sending closed captioning. Embedding the closed captioning data depends on an active live stream by the same name. Real-time closed captioning is not supported on Webcam and file or live stream as URL source.