Free template · Brand

B-Roll

Secondary footage in any region while your base video keeps playing: split screens, picture-in-picture reactions, b-roll cutaways. Flush mode with a divider seam for duets, card mode for floating panels, credit chip for stock attribution.

Design

Aspect ratio

How to use it

Put this in your video

Cut to a second clip without leaving your face: split screen, picture in picture, reaction. Paste this into Claude Code, Codex, or any coding agent.

Prompt

Use the OverlayMotion video templates from https://github.com/ricardo/overlay-motion Add the B-Roll template with my second clip in the right panel from 5s to 11s, labelled "Live reaction", muted, with the divider seam.

Have ready: The secondary clip, plus the credit line if it is stock footage.
Works over any clip, and still renders with no clip at all.
Defaults to the right panel for about 6 seconds. Ask for another spot, a start time, or a longer hold.
A correction is one sentence: “Make it a floating card in the top right instead.”

Read the full quick start

Technical reference: props, spec knobs and JSON

Template props

Inputs

Everything inside the overlay's props. Omit one and its default applies.

srctextRequired

kindvideo | imageOptional

mutedtrue / falseDefault true

fitcover | containDefault "cover"

focustextOptional

framecard | flushDefault "card"

dividertop | bottom | left | rightOptional

labeltextOptional

credittextOptional

sfxfalse | cue name | file pathDefault "whoosh"

Sound as the panel slides in. false is silence, any cue name or audio path swaps it.

All 46 accepted values

falsepopbubbletickdingwhooshkeyboard-typing-naturalmouse-click-pressmouse-click-releasetypewriter-scissor-metallic-lowtypewriter-scissor-metallic-basstypewriter-scissor-metallic-subtypewriter-scissor-metallictypewriter-scissor-lowtypewriter-scissor-deeptypewriter-laptoptypewriter-chiclettypewriter-scissortypewritertypewriter-softtypewriter-mechanicaltypewriter-digitaltypewriter-heavytypewriter-thocktypewriter-steeltypewriter-slamtypewriter-buttontypewriter-switchtypewriter-keycapclickclick-crispclick-roundclick-glasstogglesuccesserrornotificationsparkleswoopriserimpactglitchshutterswipedropdisplay

Spec knobs

What the spec changes without touching props

These live on the overlay, not in this template. They are renderer-provided, so they behave the same here as on every other template.

region: Where it sits. One of the 12 named boxes, or your own { "x": 62, "y": 12, "w": 34, "h": 42 } in percent of the frame. This template is designed around right-panel, which is what it uses when the spec says nothing.
fullscreentop-bannerlower-thirdupper-thirdcaption-zoneleft-panelright-panelcentercorner-tlcorner-trcorner-blcorner-br
scale: Uniform size inside the resolved region, 0.25 to 2. Props that size the artwork stay relative to the region box, so scale is how an overlay grows past it.
time: When it lives: start, duration, or the appear + hold pair (entrance length plus how long the finished overlay stays). Seconds (3s), percentages (66%) and negative seconds from the end (-2s) are all valid.
motion: Object motion, applied to the element itself so nothing is cropped or zoomed. Unset here, so add { "style": "shake" } (or wobble, float, sway-3d) with amount (0..1) and its own time window, or one of the skew-* sweeps for a single slow turn into a perspective keystone. Pass an array to stack several.
shakewobblefloatsway-3dskew-rightskew-leftskew-upskew-downnone
enter: Renderer-owned entrance, 0.6s, identical on every template. It stacks with whatever entrance the template already runs, so set the template's own entrance prop to none when you drive it from here.
slide-leftslide-rightspringmask
exit: How it leaves: blur-out melts it away, fade-down drifts down, shrink scales to center (0.9s each), vanish pops it out of existence in 0.45s. Set one and the template's own fade steps aside.
blur-outfade-downshrinkvanish
camera: Moves the region's VIEWPORT rather than the element: push-in, pull-out, the pan-* family, handheld. Its own transform layer, so it stacks with motion, enter, exit and scale.
sound: Per-overlay override of the spec's sound block: enabled, volume, and a sounds map that remaps one cue by name ({ "pop": "ding" }, a path to your own file, or false to mute just that cue). The map is keyed by CUE, so remapping pop also changes an exit: "vanish", which fires pop too. To change only this template's own sound, use its sfx prop instead. Core palette: click, pop, whoosh, ding, typewriter.
All 45 premade cues
popbubbletickdingwhooshkeyboard-typing-naturalmouse-click-pressmouse-click-releasetypewriter-scissor-metallic-lowtypewriter-scissor-metallic-basstypewriter-scissor-metallic-subtypewriter-scissor-metallictypewriter-scissor-lowtypewriter-scissor-deeptypewriter-laptoptypewriter-chiclettypewriter-scissortypewritertypewriter-softtypewriter-mechanicaltypewriter-digitaltypewriter-heavytypewriter-thocktypewriter-steeltypewriter-slamtypewriter-buttontypewriter-switchtypewriter-keycapclickclick-crispclick-roundclick-glasstogglesuccesserrornotificationsparkleswoopriserimpactglitchshutterswipedropdisplay

JSON spec

Copy and customize

This exact spec drives the preview. Replace media paths and props with your own.

{
  "theme": "<your-brand-tokens>",
  "version": 1,
  "format": "square",
  "fps": 60,
  "durationSec": 6,
  "source": {
    "type": "none"
  },
  "sound": {
    "enabled": true,
    "volume": 1,
    "sounds": {}
  },
  "overlays": [
    {
      "template": "b-roll",
      "region": "right-panel",
      "time": {},
      "props": {
        "src": "/demo/broll-demo.mp4",
        "label": "Live reaction",
        "credit": "CC BY-SA — Wikimedia"
      }
    }
  ]
}