If you have a video and need to extract the spoken words into a text document, you can use several tools:

: You can add text bubbles that follow motion using Final Cut Pro X .

: If you are editing, you can use Edit > Transcribe to Captions to generate text from audio. 2. CEA-708 Captioning (Digital Captions)

: Convert standard caption files (like .srt or .vtt) into the 708 format for broadcast or professional delivery. 3. Adding Text Overlays If you want to add text inside the video:

: You can hardcode subtitles onto an MP4 using MP4Box or similar command-line tools.

[Q] Support for CTA-608/708 captioning in SEI messages #2693