Asciicast player

--format cast writes an asciicast, the narration as MP3 and an HTML page that plays both. The text stays selectable, and the audio drives the player, so seeking stays in sync.

narratty build examples/cast/cast.narratty.yaml --format cast   # cast.cast, cast.mp3, cast.html

terminal: {width: 960, height: 540, font_size: 20}
scenes:
  - id: intro
    narration: >-
      This is not a video. It is an asciicast with a narration track, so you can
      select and copy the text.
    actions:
      - run: ls -1
  - id: size
    narration: The recording itself is only a few kilobytes.
    actions:
      - run: echo "Hello from an asciicast"

See Asciicast with narration to embed the .cast and .mp3 in your own page.