Cuts the main subject out of a video and gives you a matte for every frame

You give it an ordinary video clip, with no prompt and no clicking around the subject. It finds the main subject on its own and returns two videos. The first is your clip with the background swapped for flat green, ready to key out in any editor. The second is the matte: a black and white version of the clip where white means "keep" and black means "remove", which you can drop onto a track in DaVinci Resolve, Premiere or After Effects to place the subject over anything.

Most background removers cut each frame on its own, so the edges can jump around from one frame to the next. Here a video model draws the mask for the whole clip in one go, which is meant to keep the outline steady while the subject moves. The examples on the model page go after the hard cases on purpose: backlit hair, dog fur, smoke, fire, a sheer curtain and pouring water.

Under the hood it is a small add-on (a LoRA) that turns Lightricks' LTX-2.5 video generator into a cutout tool instead of a clip maker.

The Alpha Gen demo Space runs in your browser. Start with the man jumping rope example and open the matte panel: the rope is thin and moving fast, so it shows quickly how fine the edges get. Then upload a clip of your own, around five seconds or less, ideally with one clear subject. The demo trims it to fit and takes about half a minute per run on Hugging Face's shared free GPUs, so a free account gets a limited number of runs. Running it yourself means requesting access on the model page and a data center GPU for full resolution.

It decides on its own who the main subject is, so with two people in frame you cannot pick one. It is built for short clips: past about six seconds the model page warns that colors from the original start bleeding into the mask, and the demo stops at five. The weights are gated and come under the LTX-2 community license, which also covers what you make with them, so read its terms before any paid project.

• Put a presenter on a new background without filming against a green screen.
• Place titles or graphics behind a moving subject instead of on top of it.
• Lift a pet or product out of a phone clip for a social post.
• Get a rough first pass on rotoscoping before cleaning it up by hand.
• Swap the sky or the room behind someone in a short shot.

Try the demo

View model page

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