BACH just dropped — your avatar holds across every shot
Video Rebirth's new AI video engine builds character identity from bone structure up. Multi-shot films with one locked face, in one workflow.
- Video Rebirth launched BACH on May 7, an AI video engine focused on character consistency and multi-shot direction.
- BACH 1.0 Preview ranked #6 globally on the Artificial Analysis Video Arena before its public launch.
- Its Montage feature renders a 30-second multi-shot film with synced audio in a single pass, native 1080p.
Singapore-based Video Rebirth, founded by former Tencent distinguished scientist Dr. Wei Liu, launched its AI video engine BACH on May 7. It's live at bach.art with free credits for new sign-ups.
The angle worth tracking if you make avatar content: character identity stays locked across multiple shots in one render. No clip chaining, no manual stitching to hide face drift between cuts.
What's new
BACH is built around two proprietary architectures. A Dual Diffusion Transformer (DDiT) handles directorial control: whip pans, rack focus, dolly moves and lighting setups read as actual cinematography rather than vague style tags. Physics-Native Attention (PNA) handles identity: it models bone structure, skin tone and the muscular dynamics behind expression, so the same character holds frame after frame.
The headline feature is Montage. You upload reference photos and location stills, describe the shot sequence, and BACH returns up to 30 seconds of multi-shot film with consistent identity, coherent transitions and synced ambient audio. Output is native 1080p, not interpolated. Sound effects, voiceover and background music are generated alongside the visual in the same workflow.
BACH 1.0 Preview ranked #6 globally on the Artificial Analysis Video Arena before its public launch. New users get free credits on sign-up, and Video Rebirth is running a launch promo where May credits never expire.
Video Rebirth raised $80 million from AMD-backed investors earlier in the year, and ran a closed pilot with enterprise partners before opening BACH to the public. Those partners include a major global e-commerce platform, film and TV studios, short-drama workshops, ad agencies and game studios. The pilots focused on how BACH fits into existing production pipelines, which is unusual for an AI video tool at this stage and signals that Video Rebirth is going for production use cases rather than prosumer.
Receipts: Video Rebirth's launch announcement is on PRNewswire (May 7, 2026), and the product is at bach.art.
How to try it
The following images were generated using Nano Banana 2:
- Sign up at bach.art. New users get a batch of free credits at sign-up, and credits earned in May carry no expiry under the launch offer. That's enough to test a couple of full Montage renders before committing to a paid plan.
- Prepare a reference portrait. BACH binds character identity to a single reference photo, so the quality of that photo matters more than anything else you upload. A clean, straight-on portrait at the highest resolution you can render works best. Below is the kind of frame Montage responds well to, produced with Nano Banana 2.
Image prompt (Nano Banana 2): Editorial portrait of a 28-year-old woman, warm olive skin, dark wavy hair pulled back, soft natural daylight from a window to her left, looking straight at camera, neutral confident expression, shallow depth of field, premium creator aesthetic, no text overlays, no logos
- Write a shot list. Three to five distinct shots, each with one emotion and one camera move. Montage reads shot-level direction in plain English, not paragraphs of mood. Whip pans, rack focus, dolly-in and Rembrandt key lighting all come through as the actual camera language, not as vague style tags.
- Add 1–2 location stills. BACH binds identity from your portrait and lighting from the location frames. Even simple iPhone shots of the space you want to recreate will work as guides.
- Generate at 1080p. A 30-second multi-shot output comes back in one pass with synced ambient audio, voiceover and background music if you ask for them. Output is delivered as a single native 1080p file, ready to drop into an editor.
A second worked example, for an anger-to-grief transition:
Image prompt (Nano Banana 2): Tight close-up of the same 28-year-old woman, low warm rim light from behind, single tear catching the light on her cheek, eyes glassy and lowered, soft contemplative expression, shot on 85mm lens depth of field, premium creator aesthetic, no text overlays, no logos
Shot prompt for BACH Montage: Shot 1: wide, character on an apartment balcony at golden hour, calm composure, slow push-in. Shot 2: medium, character reads a message on her phone, anger in her eyes, handheld shake. Shot 3: close-up, single tear, head tilted down, slow rack focus from phone to eye.
One thing to keep in mind: BACH animates a reference, it does not generate the character. The consistency you get is locked to whatever face you upload. If you don't already have a consistent avatar to feed it, BACH renders very polished output of a face that's still essentially stock. Pair it with whatever you use for character generation, not as a replacement for it.
Closing
If you're still working on the character side, our avatar guide covers how to get a consistent reference set together. From there, BACH is one of the better engines for stitching shots into a scene.
FAQs
How long can a single BACH output be?
Up to 30 seconds in one Montage pass. For longer narratives, you can chain montages and BACH preserves identity across them.
Does BACH generate the character or just animate one I provide?
It animates one you provide. You upload a reference portrait, and BACH binds identity to that face across all the shots in your render.
Can I use BACH commercially?
BACH output ships native 1080p with a commercial license. Make sure the reference portrait you upload is one you have the rights to.
Will BACH work with portraits from Nano Banana 2 or other image models?
Yes. Any clean, high-resolution portrait works as a reference. Straight-on framing, neutral expression and even lighting tend to give Montage the most to work with.
How does BACH compare to Kling 2.6 Pro or Wan 2.6?
For multi-shot scenes with one locked character, BACH is ahead right now. For single-shot stylised motion or text-to-video without a character constraint, the general video models still pull ahead.
Who is BACH built for?
Based on its pilot programs, it's aimed at production teams: e-commerce video, film and TV studios, short-drama workshops, ad agencies and game studios. Solo creators can use it too, but the directorial control assumes you know what a whip pan or rack focus actually is.