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 Pro Video Extend
alibaba/wan/3.0/pro/video-extendWan 3.0 Pro Video Extend by Alibaba continues an input video forward from a text instruction, optionally guided by reference images and audio, with native audio, upscaled to 1080p, 2K, or 4K.
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).
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.
Output resolution tier after FlashVSR super-resolution.
Advanced settings
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).
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.
ResultIdle
Your output will appear here
Complete the inputs, then click Run.
Wan 3.0 Pro 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. Pro runs the same Wan 3.0 model, then upscales the result with FlashVSR, so output comes back at 1080p, 2K, or 4K. For 480p or 720p use the non-Pro endpoints.
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 | 1080p / 2k / 4k | 1080p | Output tier after FlashVSR super-resolution; 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 Wan 3.0 Pro rule, billed seconds are the source clip length (rounded up) plus the new segment: $0.18 at 1080p, $0.20 at 2K, $0.23 at 4K 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 | 1080p | 2K | 4K |
|---|---|---|---|---|
| 5s + 5s | 10s | $1.80 | $2.00 | $2.30 |
| 10s + 5s | 15s | $2.70 | $3.00 | $3.45 |
| 15s + 5s (default) | 20s | $3.60 | $4.00 | $4.60 |
| 15s + 15s | 30s | $5.40 | $6.00 | $6.90 |
With duration: "auto" the run is pre-authorized at 30 seconds, then settled on the length that was actually generated. Failed runs are not charged. Output files are copied to SandBase storage and the returned URL stays valid for 7 days; download anything you need to keep.
Prompting
- Describe what happens next, not what the source already shows: “Extend Video 1 forward: the baker carries the tray to the oven and the camera follows.”
- Mention the subject and direction of movement again if continuity matters.
- Keep the source short when you need a long extension; both count toward 30 seconds.
Limits
- The returned video is the extension only; the source is not included.
- To change the existing footage instead, use video-edit.
Also on SandBase
Other Wan 3.0 Pro endpoints: alibaba/wan/3.0/pro/video (all modes in one schema), alibaba/wan/3.0/pro/text-to-video, alibaba/wan/3.0/pro/image-to-video, alibaba/wan/3.0/pro/reference-to-video, alibaba/wan/3.0/pro/video-edit.
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "alibaba/wan/3.0/pro/video-extend",
"video": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260402/ldnfdf/wan2.7-videoedit-style-change.mp4",
"duration": 5,
"resolution": "1080p",
"generate_audio": true
}
SANDBASE_JSON
)
run_id=$(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 resolution tier after FlashVSR super-resolution.
Default: "1080p"
Possible values: "1080p", "2k", "4k"
generate_audioboolean
Generate a synchronized audio track. Pricing is the same either way.
Default: true
{
"model": "alibaba/wan/3.0/pro/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": "1080p",
"generate_audio": true
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
No example output has been published yet. Use Playground → Result → JSON after a completed run to inspect your response.