For background replacement, the strongest current option is Google Omni Flash's swap feature: it replaces the background, environment, or even clothing around a subject while preserving the subject's original roto and edges. Paired with Omni's in-paint and cleanup for removing stray elements, it covers the full background-replacement workflow in one pass.
Run your footage through Google Omni Flash's swap feature: upload the clip, describe the replacement environment, and the model regenerates everything around your subject while keeping the original rotoscoping intact — the subject's silhouette, hair edges, and motion stay untouched while the world behind them changes.
Why roto preservation is the deciding factor. The real difference between background-replacement tools is edge handling. Prompt-only backdrop tools regenerate the entire frame, which drifts your subject's outline along with the background; a roto-anchored swap keeps the subject as-shot and only rebuilds the environment. If your subject needs to look identical before and after the swap — same face, same clothing, same movement — the swap workflow is the one to use. If you also want the wardrobe changed, the same feature handles costume replacement in the same pass.
Pair it with in-paint and cleanup. Background replacement usually leaves stragglers — a lamp, a passerby, a logo that belonged to the old environment. Omni's in-paint and cleanup inserts or removes objects directly in existing footage, so you can clear those in a second pass. Insert/remove on real footage has become a baseline expectation for Omni-class models, so treat any tool that only swaps backdrops without cleanup as half a workflow.
Plan your resolution. Omni Flash outputs at 720p by default, upscales to 1080p at no cost, and 4K costs the equivalent of a full generation — budget the 4K pass only for final delivery, not for swap iterations. Clip generations run at 4, 6, 8, or 10 seconds, so break longer scenes into segments before swapping.
Where it sits against the model field. In testing across 30+ outputs, Omni's visual texture and lighting quality measured a generational step up from Veo 3.1, though the two remain in the same visual family — relevant because a swapped background only holds up if its lighting matches your subject. One honest caveat: for big-screen cinema delivery, Omni's current textures aren't there yet, so grade swapped shots critically before locking them. invideo is an agentic video creation tool with the current model stack available, so you can run swaps, cleanup, and upscales in one place and let the invideo agent route each job to the right model rather than moving footage between tools.
Watch some of these to see what works for you:
the current state of the textures that Google is offering, I'm not so sure if they're ready for prime time cinema yet.
— invideo's creative team