Extend Video takes an existing video and continues it, generating new footage that carries on from where your clip ends. You provide a source video, describe what should happen next, and generate a longer result.
What does Extend Video do?
It uses your video as the starting point and generates additional footage from its ending. The source video "sets how your video starts," and the model continues the action based on your description and settings.
Paid users start with UltraS 720P selected. Free users keep their existing Fast 720P starting option; they can switch Fast to the new 480P option when they want it.
How do I add the source video?
In the source area, use:
Select content — pick a video from your own generations (followed by curated inspiration) or the community feed.
Upload video — upload your own file.
Once added, the video plays in the panel with a Delete control to remove it. If you're not logged in, Select content opens the sign-in dialog first.
Can I set how the extended video ends?
Yes. You can add a last frame image as the ending target. Click Add last frame; the hint reads "Last frame sets how your video ends. If it doesn't connect naturally to the source video, the result might feel random." You can also use Generate last frame from source video to create that ending image, or Remove last frame to clear it.
Why is "Add last frame" greyed out?
Last frame is only supported on certain quality modes and only for single-shot extends. Related notes you may see include "Last frame is only supported in Ultra mode" and "Last frame is only supported for single-shot video generation."
What is the description box for?
The description tells the model what should happen in the new footage. (Unlike Text to Video and Image to Video, Extend Video has camera movement turned off in the current build, so there's no per-shot camera-movement option here.) On a quality tier that doesn't support descriptions, the box is replaced by a "Description only available under" prompt with a button showing the supporting quality names you can tap to switch.
What is "Native audio"?
A Native audio toggle sits below the description. Turning it on generates synchronized sound for the extended footage. On the highest tier it's required — trying to switch it off shows "Native audio is required for UltraS quality."
Can I extend into multiple shots?
No. Extend Video is single-shot only — there's no Add shot button or multi-shot mode in this flow, on any quality. You describe one continuation and generate it.
How long can the result be?
The extra length is set by the Extend duration control in the workstation's bottom bar. Fast supports 4s, 5s, and 10s. Ultra and UltraS support 5s, 10s, 15s, 20s, and 25s.
Which resolution does Fast support?
Fast offers 480P, 720P, and FHD. Hover the Fast quality control on desktop, or tap its info icon on mobile, to see "Powered by MiniMax H3"; MiniMax H3 is emphasized in the tooltip. Fast continues to start at 720P unless you select 480P.
Can I keep extending the same video?
Yes — you can extend a clip, then extend the result again to keep making it longer (for example 4s → 8s → 12s). Each pass is generated from the previous clip's ending, so after several rounds the quality can start to drift: fine detail may soften or the character may warp. If that happens, go back to an earlier, cleaner version rather than extending it further.
What does Reuse restore?
Reuse restores the saved Extend Video inputs, including the source video, description, quality, resolution, and extend duration. Fast 480P and Fast 10s are preserved whether you reuse the result immediately from generation history or after its detail data loads.
How much does it cost?
Like other video modes, extending is priced per second of new footage, so the cost scales with your extend duration. The per-second rate is shown next to Generate and depends on your plan and the quality you pick (it also reflects resolution and options). See Credits & billing.
On mobile
Extend Video works on mobile with the same source-video, last-frame, description, and native-audio controls arranged for a narrow screen. Quality, resolution, and extend duration live in the bottom bar.