seedinteger
Random seed (0-2147483647) for reproducible results. Omit for a random seed; the same seed may still produce slightly different results.
Minimum: 0
Maximum: 2147483647
Wan 3.0 Video Extend
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alibaba/wan/3.0/video-extendWan 3.0 Video Extend by Alibaba continues an input video forward from a text instruction, optionally guided by reference images and audio, with native audio.
Try the model
Playground
Input
Text instruction describing the extension. Refer to the input video as Video 1 and to reference images or audio as Image 1, Audio 1, and so on.
URL of the input video (MP4 or MOV; 1-15 seconds, at least 16 fps, 240-4096px per side, under 100MB).
Additional Settings More
Customize your input with more control.
PNG, JPEG, WebP, or GIF · 20 MiB maximum each · up to 10
Up to 10 optional reference image URLs (JPEG, PNG, BMP, or WebP; up to 20MB each). Refer to them in the prompt as Image 1, Image 2, and so on.
Up to 5 optional reference audio URLs (WAV or MP3; 1-15s each, 15s total, under 15MB each).
Duration of the extension in seconds (2-30), or `auto` to let the model choose. The input video length plus this duration must not exceed 30 seconds. `auto` is pre-authorized at 30 seconds and billed on the actual output length. Allowed values: auto, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30.
Output video resolution tier. Allowed values: 480p, 720p, 1080p.
Generate a synchronized audio track. Pricing is the same either way.
Random seed (0-2147483647) for reproducible results. Omit for a random seed; the same seed may still produce slightly different results. Range: 0 to 2147483647.
ResultExample
What would you like to do next?
Examples
Select an example to load its inputs and result into the playground.
- Open result ↗
Input
{ "duration": 15, "prompt": "Extend Video 1 forward by 15s. Character A is a male with short dark brown hair wearing a black tailcoat, white shirt, black bow tie, and beige vest. Character B is a female with brown upswept hair wearing a beige puff-sleeve vintage long dress with black lace trim on the skirt, and dark teardrop earrings. Inside the ballroom, crystal chandelier light reflects off the marble floor. Guests chat in small groups, holding glasses and speaking in low voices. A graceful waltz string prelude slowly begins, and the guests' conversations gradually quiet. Character B walks slowly from one side of the ballroom, her skirt hem lightly brushing the marble floor, her gaze surveying the room. Character A emerges from the crowd, walks past the guests directly to Character B, gives a slight bow and extends his right hand, his gaze warm and attentive. Character B lowers her eyes with a gentle smile, lightly placing her right hand on Character A's palm. The two exchange a smile, and Character A leads Character B to the center of the dance floor. The surrounding guests naturally step back to make room, all eyes focused on the pair. Character A's left hand holds Character B's right hand raised, his right hand gently resting on her lower back. The two assume the waltz pose, stepping out on the downbeat of the strings, beginning to spin. The elegant atmosphere of a 19th-century court ball, warm golden tones.", "video": "https://static.sandbase.ai/examples/1fa13a8c-7f55-4902-8901-be34edffb4f8/input/0bee66fb-0c46-42f2-bf0c-df74bc7e59a5.mp4" }
Wan 3.0 Video Extend
Continue a clip past its last frame. The model carries over the subject, look, and camera language of the source and generates the next beat you describe. The response contains the new segment only, so you can cut it onto the original yourself.
Fields
| Field | Type | Default | Notes |
|---|---|---|---|
prompt | string, required | — | Up to 5,000 characters. |
video | video URL, required | — | Source clip, Video 1 in the prompt. MP4/MOV, 1–15s, ≥16fps, 240–4096px per side, ≤100MB. |
images | image URL[] (≤10) | — | Referenced as Image 1, Image 2, … |
audios | audio URL[] (≤5) | — | WAV/MP3, 1–15s each, 15s total, ≤15MB. Referenced as Audio 1, … |
duration | 2–30 or auto | 5 | Length of the new segment. Source + duration ≤ 30s. |
resolution | 480p / 720p / 1080p | 720p | Sets the per-second rate. |
generate_audio | boolean | true | Native dialogue, music, and effects. Same price on or off. |
seed | integer 0–2147483647 | random | Fix it to compare prompt changes. |
The aspect ratio always follows the source, so there is no aspect_ratio field.
Billing
Following the official Wan 3.0 rule, billed seconds are the source clip length (rounded up) plus the new segment: $0.05 at 480p, $0.10 at 720p, $0.20 at 1080p per second. References are not metered. If the source length cannot be read, 15s is assumed, which is also what the listed starting price uses.
| Source + new segment | Billed | 480p | 720p | 1080p |
|---|---|---|---|---|
| 5s + 5s | 10s | $0.50 | $1.00 | $2.00 |
| 10s + 5s | 15s | $0.75 | $1.50 | $3.00 |
| 15s + 5s (default) | 20s | $1.00 | $2.00 | $4.00 |
| 15s + 15s | 30s | $1.50 | $3.00 | $6.00 |
With duration: "auto" the run is pre-authorized at 30 seconds, then settled on the length that was actually generated. Failed runs are not charged. Output files are copied to SandBase storage and the returned URL stays valid for 7 days; download anything you need to keep.
Prompting
- Describe what happens next, not what the source already shows: “Extend Video 1 forward: the baker carries the tray to the oven and the camera follows.”
- Mention the subject and direction of movement again if continuity matters.
- Keep the source short when you need a long extension; both count toward 30 seconds.
Limits
- The returned video is the extension only; the source is not included.
- To change the existing footage instead, use video-edit.
Also on SandBase
Other Wan 3.0 endpoints: alibaba/wan/3.0/video (all modes in one schema), alibaba/wan/3.0/text-to-video, alibaba/wan/3.0/image-to-video, alibaba/wan/3.0/reference-to-video, alibaba/wan/3.0/video-edit.
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "alibaba/wan/3.0/video-extend",
"video": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260402/ldnfdf/wan2.7-videoedit-style-change.mp4",
"duration": 5,
"resolution": "720p",
"generate_audio": true
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
status=$(printf '%s' "$result" | jq -r .status)
case "$status" in completed|failed|timeout) break ;; esac
sleep 2
result=$(curl --fail-with-body --silent \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
"https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"2. Authentication
Create a SandBase API key and set it in your server environment. All requests use Bearer authentication.
export SANDBASE_API_KEY="YOUR_API_KEY"Keep the key on your server. Do not expose it in browser code or commit it to a repository.
3. Queue
Submit a request
POST to /v1/run with this model ID and its inputs. The request example above includes submission and polling.
Fetch request status and result
Use the returned run ID to poll until the status is completed, failed or timeout. Read output only after completed.
curl "https://api.sandbase.ai/v1/run/$RUN_ID" \
-H "Authorization: Bearer $SANDBASE_API_KEY"4. Files
Hosted files
Pass a publicly accessible file URL in the model’s image, video or audio field. Supported formats and limits are shown beside each Playground input.
Uploading images
Use the upload or replace control on supported image fields in the Playground. Video URL fields accept a hosted driving video; they do not imply video-upload support.
5. Schema
Input
videostringrequired
URL of the input video (MP4 or MOV; 1-15 seconds, at least 16 fps, 240-4096px per side, under 100MB).
audiosarray
Up to 5 optional reference audio URLs (WAV or MP3; 1-15s each, 15s total, under 15MB each).
imagesarray
Up to 10 optional reference image URLs (JPEG, PNG, BMP, or WebP; up to 20MB each). Refer to them in the prompt as Image 1, Image 2, and so on.
promptstringrequired
Text instruction describing the extension. Refer to the input video as Video 1 and to reference images or audio as Image 1, Audio 1, and so on.
durationvalue
Duration of the extension in seconds (2-30), or `auto` to let the model choose. The input video length plus this duration must not exceed 30 seconds. `auto` is pre-authorized at 30 seconds and billed on the actual output length.
Default: 5
Possible values: "auto", 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30
resolutionstring
Output video resolution tier.
Default: "720p"
Possible values: "480p", "720p", "1080p"
generate_audioboolean
Generate a synchronized audio track. Pricing is the same either way.
Default: true
{
"model": "alibaba/wan/3.0/video-extend",
"video": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260402/ldnfdf/wan2.7-videoedit-style-change.mp4",
"duration": 5,
"resolution": "720p",
"generate_audio": true
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
[
{
"poster": "https://static.sandbase.ai/examples/posters/6f417ce10b1edfebadcd.jpg",
"source": "Alibaba Cloud",
"source_url": "https://www.alibabacloud.com/help/en/model-studio/wan3-video-generation-guide",
"url": "https://static.sandbase.ai/examples/1fa13a8c-7f55-4902-8901-be34edffb4f8/output/eed48bf4-98c4-4018-acf7-bf471db78b35.mp4"
}
]