--- title: "FLUX 3 (Extend Video)" description: "FLUX 3 video continuation via Black Forest Labs. Routing target for the FLUX 3 node when a clip is wired into Video to Extend; not independently browsable. Billed on BFL’s continuation rate table, which is higher than text- or image-to-video." updated: 2026-09-19 --- # FLUX 3 (Extend Video) **Node type:** `video:flux_3_extend` **Category:** `video` **Hidden in sidebar:** yes (auto-selected by routing) ## Description FLUX 3 video continuation via Black Forest Labs. Routing target for the FLUX 3 node when a clip is wired into Video to Extend; not independently browsable. Billed on BFL’s continuation rate table, which is higher than text- or image-to-video. ## Pricing - **Cost:** ~69 credits per second - **Per-second rate:** The figure is the rate at a 5-second reference run. Our margin is progressive and steepest on the smallest runs, so a clip shorter than that can cost more per second, and a model priced with a flat multiplier is exact at every length. The charge is always computed from the real duration. - **Notes:** Source: docs.bfl.ml pricing, checked 2026-08-05 — the VIDEO CONTINUATION line, which is a different rate table from t2v/i2v. Continuation: $0.43/s at hd, $0.54/s at fhd. Draft: $0.12/s at ANY resolution (pricing.rateOverrides, because it replaces the per-second rate rather than shifting the resolution tier). RAW costs, so marginMultiplier is intentionally undefined and the progressive margin applies. Re-verify against the first BFL invoice. ## Variant family - **Family:** `flux-3-video` - **Is primary:** no - **All variants:** `video:flux_3`, `video:flux_3_i2v`, `video:flux_3_extend` ## Canvas ports These appear as port handles on the left side of the node. | ID | Label | Details | | --------------- | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `prompt` | **Prompt** | `TEXT` _(required)_ · multiline | | `image1` | **Start Image** | `IMAGE` — Wire an image to animate it (image-to-video). Leave empty for text-to-video. Add an End Frame for a start-to-end pair, or extra Keyframes for a storyboard. | | `image2` | **Keyframe 2** | `IMAGE` — Optional extra keyframe. With 3 or more images wired (End Frame included), FLUX 3 runs as a storyboard and the keyframes are spread EVENLY across the chosen Duration: the first sits at 0s, the last at the end, the rest at equal intervals. Two images means first frame and last frame. | | `image3` | **Keyframe 3** | `IMAGE` — Optional extra keyframe. With 3 or more images wired (End Frame included), FLUX 3 runs as a storyboard and the keyframes are spread EVENLY across the chosen Duration: the first sits at 0s, the last at the end, the rest at equal intervals. Two images means first frame and last frame. | | `image4` | **Keyframe 4** | `IMAGE` — Optional extra keyframe. With 3 or more images wired (End Frame included), FLUX 3 runs as a storyboard and the keyframes are spread EVENLY across the chosen Duration: the first sits at 0s, the last at the end, the rest at equal intervals. Two images means first frame and last frame. | | `image5` | **Keyframe 5** | `IMAGE` — Optional extra keyframe. With 3 or more images wired (End Frame included), FLUX 3 runs as a storyboard and the keyframes are spread EVENLY across the chosen Duration: the first sits at 0s, the last at the end, the rest at equal intervals. Two images means first frame and last frame. | | `end_image_url` | **End Frame** | `IMAGE` — Optional last frame. With a Start Image wired, FLUX 3 interpolates from the start image to this one. Always counts as the LAST keyframe. Wiring it with no Start Image is refused before you are charged, because a single keyframe is read as the OPENING frame. | | `video_url` | **Video to Extend** | `VIDEO` — Wire a clip to continue it: FLUX 3 picks up from its final frames and carries the motion and framing forward with no cut. Video continuation is billed at a HIGHER rate than text- or image-to-video. Cannot be combined with keyframe images — that combination is refused before you are charged. | ## Sidebar config These render as form fields in the right-side config panel when the node is selected. | ID | Label | Details | | ---------------- | ------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `aspect_ratio` | **Aspect Ratio** | `TEXT` · options: `auto`, `21:9`, `2:1`, `16:9`, `4:3`, +3 | | `duration` | **Duration (seconds)** | `TEXT` · options: `5`, `6`, `7`, `8`, `9`, +11 | | `resolution` | **Resolution** | `TEXT` · options: `hd`, `fhd` | | `draft` | **Draft (fast preview)** | `BOOLEAN` — Much faster and much cheaper (6 credits/second at any resolution), at lower quality. Use it to iterate on the prompt, then turn it off for the final render. | | `generate_audio` | **Generate Audio** | `BOOLEAN` | ## Outputs | ID | Label | Type | | ------- | ------------------- | ------- | | `video` | **Generated Video** | `VIDEO` | --- _Auto-generated from the Wireflow node registry._ --- Documentation index: fetch https://www.wireflow.ai/llms.txt for the full list of Wireflow docs.