Bria Video Green Screen

Bria Video Green Screen is the node that turns "background replacement" into a job for a video editor later. Instead of just cutting the subject out (that's the transparent-background sibling), it replaces the background with a solid chroma-key screen - so what comes out the other side is a clip you can key against anything in a proper NLE, or immediately chroma-key in ComfyUI itself. Think of it as background removal that outputs a broadcast-ready green-screen plate instead of an alpha channel.

It's a built-in Bria partner node, so the replacement is a cloud call through Comfy's API: your video goes up to Bria, a chroma-keyed clip comes back, and you're billed per second. No local model involved. If you don't need a green screen and just want the subject on a plain backdrop, Bria Video Replace Background is the more direct tool - the green-screen route exists for people who plan to key the footage downstream.

The inputs

• video - the clip whose background gets replaced. Validated to a 60-second max before billing.
• green_shade - which solid chroma-key color to use. Three options, with the hex values in the tooltip:
  • broadcast_green (#00B140) - the safe, standard studio green.
  • chroma_green (#00FF00) - the screaming classic.
  • blue_screen (#0000FF) - for when the subject is wearing green, or you want the legacy VFX route.
• seed - re-run control only; results are nondeterministic regardless of seed.

What comes out

A single VIDEO output with the solid chroma-key background baked in (delivered as H.264 mp4).

Gotchas

• Pick the shade that doesn't collide with your subject. That's the whole green_shade decision: if your talent wears green, go blue. The option exists for exactly this reason.
• It's a paid per-second call, and it's not your compositor. If your final background is already known, skipping the green screen and using Bria Video Replace Background saves a round trip (and a keying step).
• Green spill is a thing. Subjects near the screen edge pick up a green tint; the standard fix is a despill in your editor or a smaller subject-to-screen margin. The node doesn't clean that for you.
• 60s cap, and the usual seed caveat. Longer clips are rejected pre-billing; seed is a re-run key, not a reproducibility guarantee.

If your pipeline ends in a video editor, this node slots in beautifully: Bria does the hard per-frame separation, your editor does the keying with tools it already trusts - and you keep full control of the final backdrop.