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Adds stylized captions designed to look cinematic or “YouTube documentary” style. Cc Font Selection: Choose fonts for your captions. Primary font is used for most words, secondary font adds visual variety for emphasis. Color Override: Override the AI-selected text colors with a fixed color for all captions. Let AI choose colours: Mosaic AI will choose colours based off the colours in the video. Good for:
  • Talking head videos
  • Interviews
  • Short-form content

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API Info

  • Node ID: dfa94b02-6a18-4922-9613-636bd202d69d

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Node params

ParamTypeRequiredDefaultNotes
font1stringNo"Montserrat"Primary font family.
font2string | nullNonullSecondary/accent font family. Set to null/omit to use only font1.
color_overridestring | null (hex)NonullIf set, forces this color onto generated caption spec.
text_bg_enabledbooleanNofalseEnable text background box.
text_bg_colorstring (hex)No"#000000"Text background color.
text_bg_opacitynumberNo0.6Text background opacity (0.1-1.0).
text_bg_roundnessnumberNo6Text background corner radius (0-20).
animation_style"pop" | "slide" | "fade" | "bounce" | "typewriter" | "wave" | "cinematic" | "highlight"No"pop"Caption animation preset.
stroke_enabledbooleanNotrueEnable stroke on caption text.
stroke_colorstring (hex)No"#000000"Stroke color.
stroke_widthnumberNo2Stroke width (0-8).
shadow_enabledbooleanNofalseEnable text shadow.
shadow_blurnumberNo10Shadow blur radius (0-40).
shadow_colorstring (hex)No"#000000"Shadow color.
shadow_opacitynumberNo0.5Shadow opacity (0.1-1.0).
uniform_word_sizebooleanNofalseForce consistent word sizing.
single_linebooleanNofalseForce single-line captions.
caption_position"auto" | "top-left" | "top" | "top-right" | "left" | "center" | "right" | "bottom-left" | "bottom" | "bottom-right"No"auto"Caption placement.

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Parameter groups

  • Font pairing: font1, font2
  • Color policy: color_override, text_bg_*
  • Animation & layout: animation_style, caption_position, single_line, uniform_word_size
  • Edge styling: stroke_*, shadow_*

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Runtime notes

  • If color_override is null, AI style generation chooses colors from scene analysis.
  • Runtime validates/fetches fonts from remotion template; invalid font names can fail render.
  • font1/font2 should be valid Google Font family names.
  • For API overrides, pass these via update_params[agent_node_id].

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Example

{
  "font1": "Montserrat",
  "font2": "Besley",
  "color_override": null,
  "animation_style": "cinematic",
  "caption_position": "bottom",
  "text_bg_enabled": true,
  "text_bg_color": "#000000",
  "text_bg_opacity": 0.55,
  "stroke_enabled": true,
  "stroke_color": "#000000",
  "stroke_width": 2
}