Start with the destination, not the prompt. Choose where the clip will be viewed, select the matching frame shape, pick a resolution tier, and then divide the action into short, time-coded shots. Wan 3.0 documentation lists 21:9, 16:9, 4:3, 1:1, 3:4, and 9:16 ratios; 480P, 720P, and 1080P output; and clips from 2 to 30 seconds (or smart duration). For image-led work, use adaptive ratio so the generated video follows the supplied frame. Exact pixel sizes, model availability, and parameter names can vary by service and region.
What aspect ratio means in Wan 3.0
Aspect ratio describes the width of a video frame compared with its height. A 16:9 frame is wider than it is tall, a 9:16 frame is tall and narrow, and a 1:1 frame has equal width and height. The ratio affects every composition decision: where a subject stands, how much background fits on screen, how camera movement reads, and where captions or interface overlays can be placed.
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Alibaba Cloud Model Studio’s Wan 3.0 guide, updated October 11, 2026, lists six fixed ratios plus adaptive ratio:
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →| Ratio | Frame orientation | Practical planning consideration |
|---|---|---|
| 21:9 | Ultrawide landscape | Leaves substantial horizontal room for scenery or lateral movement; the documentation lists the ratio but does not mandate a particular use. |
| 16:9 | Standard landscape | Provides broad horizontal space for two subjects, environmental shots, and conventional video players. |
| 4:3 | Less-wide landscape | Gives more vertical room than 16:9 while remaining horizontal. |
| 1:1 | Square | Balances width and height; useful when the same crop must work in a square placement. |
| 3:4 | Portrait | Allows a taller subject and more vertical background than a square frame. |
| 9:16 | Tall portrait | Favors full-height subjects and vertically arranged action. |
| Adaptive | Follows supplied media | Recommended in the Alibaba guide for first-frame, first-and-last-frame, editing, extension, and other reference-led workflows. |
The descriptions of composition are geometry-based guidance, not promises from the model. Keep faces, products, text, and other essential details inside the chosen frame’s central safe area because later cropping can remove edges.
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Choose the ratio from the final viewing surface
- Landscape presentation: Begin with 16:9 unless the project specifically needs an ultrawide 21:9 or a 4:3 look.
- Portrait presentation: Use 9:16 for a tall display or 3:4 when a less-extreme portrait crop suits the design.
- Square placement: Select 1:1 and compose for equal width and height from the first shot.
- Existing image or video reference: Select adaptive ratio when preserving that source’s shape matters more than forcing a new canvas.
Do not generate in one ratio and assume an automatic crop will preserve every important action. A cyclist moving near the edge in a 16:9 plan may be cut off when converted to 9:16. If several destinations are required, either design a conservative center-safe composition or generate separate versions with shot directions tailored to each frame.
Resolution tiers and actual pixel dimensions
Wan 3.0’s Alibaba Cloud documentation names 480P, 720P, and 1080P output tiers. A tier is a quality or size setting; it is not, by itself, a universal width-and-height specification across every implementation.
Leonardo.AI’s Wan 3.0 API documentation, checked October 13, 2026, provides these example dimensions. They illustrate one provider’s mapping and should not be presented as a guarantee for every Wan 3.0 endpoint.
| Tier | 16:9 | 4:3 | 1:1 | 3:4 | 9:16 |
|---|---|---|---|---|---|
| 480p | 854 × 480 | 736 × 552 | 640 × 640 | 552 × 736 | 480 × 854 |
| 720p | 1280 × 720 | 1104 × 828 | 960 × 960 | 828 × 1104 | 720 × 1280 |
| 1080p | 1920 × 1080 | 1656 × 1242 | 1440 × 1440 | 1242 × 1656 | 1080 × 1920 |
That API documentation says explicit width and height take precedence over its named resolution tier. If your service exposes width and height, verify the accepted values and aspect-ratio rules in that service’s current interface. Alibaba Cloud’s guide lists the tiers and ratios but does not provide the same complete pixel matrix in the documented section.
How to pick a tier
- 480P: A lower-size option for drafts, storyboards, or situations where speed and transfer size matter more than fine detail.
- 720P: A middle tier for reviewing motion, composition, and many ordinary web deliveries.
- 1080P: The largest listed tier for work that needs more detail, provided the chosen endpoint supports it in your region.
These labels do not establish a universal quality score, generation time, or cost. They are documented output options. Check the service dashboard or API response for the actual encoded dimensions before editing or publishing.
Duration, frame rate, and the size of a shot plan
Alibaba Cloud documents MP4 output at 30 frames per second and generation lengths from 2 to 30 seconds, with -1 representing smart duration in the documented API. A 10-second request at 30 fps contains 300 frames, but the model still has to maintain identity, motion, and scene continuity across that span.
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The same guide describes single-shot and multi-shot storyboard prompts with roughly 4–6 seconds per shot and timestamp annotations. That is a prompt-structuring pattern, not a guarantee that every transition will occur exactly on the requested second. A 20-second clip can therefore be planned as four or five beats, while a short 6-second clip may need only one or two.
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First decide the total duration, then divide it into a small number of readable actions. Give each beat one dominant action and one camera idea. Overloading a four-second segment with several locations, actors, and camera moves makes the instruction harder to interpret and the result harder to troubleshoot.
For example, a 12-second landscape clip could use:
- 0:00–0:04: Wide establishing view; the cyclist enters from the left on a wet city street; the camera tracks slowly right.
- 0:04–0:08: Medium side view; the cyclist passes a neon storefront; reflections move across the jacket.
- 0:08–0:12: Closer forward view; the cyclist looks toward the camera and brakes beside the curb.
The wording above is an original planning example. Alibaba’s examples similarly separate time ranges, camera framing, scene, action, and atmosphere.
A beginner workflow from delivery brief to prompt
1. Define the deliverable
Write down the destination, orientation, duration, and acceptable output tier before describing the scene. Record whether the clip must preserve an existing image or video frame. This prevents a visually correct generation from becoming unusable after a forced crop.
- Destination: landscape, portrait, square, ultrawide, or reference-shaped.
- Ratio: one of the listed fixed ratios, or adaptive for a supplied frame.
- Duration: 2–30 seconds, or smart duration where supported.
- Resolution: 480P, 720P, or 1080P as exposed by the selected service.
2. Describe the subject and scene plainly
Name the main subject, setting, time of day, visual style, and details that must remain stable. Use concrete nouns and observable actions. “A red raincoat with a silver bicycle on a wet street at dusk” is more actionable than “a cool urban mood.”
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Keep the number of beats proportional to the clip length. For each range, write the shot size, subject action, camera movement, and any transition. Use one line per beat so you can identify which instruction needs revision when an output fails.
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4. Specify camera behavior
State whether the view is wide, medium, close, overhead, or another clear framing. Add a movement such as a slow pan, tracking move, push-in, tilt, or locked-off view. Camera language should support the action: a tracking move suits a subject crossing the frame, while a locked-off view can make a product demonstration easier to inspect.
5. Add atmosphere and exclusions
Describe lighting, weather, palette, and overall visual treatment after the physical action is clear. Add exclusions for defects that matter to the project, such as extra limbs, unreadable signage, unwanted logos, or text overlays. Exclusions reduce ambiguity but cannot guarantee perfect prevention.
6. Add dialogue and sound only when they serve the shot
Alibaba Cloud documents native dialogue, background music, and sound effects, plus an audio setting that can be disabled. If speech is necessary, identify the speaker and place the line in the relevant time range. If synchronization is not important, disabling audio can simplify a visual draft and let you add a separately edited track.
7. Name reference assets and state their job
Reference images, videos, and audio should have a defined purpose: character appearance, wardrobe, location, motion, voice, or mood. A third-party Wan 3.0 user guide recommends labels such as @Image1, @Video1, and @Audio1; use the naming convention required by your endpoint and explain what each asset should control.
8. Generate, inspect, and revise one variable at a time
Review the frame shape first, then identity continuity, action timing, camera movement, and audio. If the composition is wrong, change the ratio or framing before rewriting the entire story. If one beat fails, shorten or simplify that beat rather than adding more adjectives to every line.
A reusable Wan 3.0 prompt outline
The official user guide’s recommended sequence is a useful checklist: duration and aspect ratio; subjects and references; scene and style; shot and motion; dialogue or sound; exclusions; and timeline. You can adapt the following outline to the syntax of the service you use:
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Duration: 12 seconds; aspect ratio: 16:9; output: 720P.
Subject and references: one cyclist in a red raincoat, matching @Image1 for face and clothing.
Scene and style: wet downtown street at dusk, realistic cinematic lighting, restrained colors.
Shot and motion:
0:00–0:04 — wide shot, cyclist enters from left, slow camera track right.
0:04–0:08 — medium side shot, cyclist passes neon storefront, rain reflections move.
0:08–0:12 — close forward shot, cyclist brakes at curb and looks toward camera.
Audio: tire spray and quiet city ambience; no dialogue.
Exclusions: no extra people in the foreground, no on-screen text, no warped bicycle wheels.This is a planning format, not a promise of exact adherence. Keep the final syntax consistent with the endpoint’s parameter names and reference rules.
Reference modes and their limits
Alibaba Cloud describes first-frame control, first-and-last-frame control, multimodal image, video, and audio references, video editing, and video extension workflows. First-frame and first-and-last-frame methods are useful when the opening or ending composition must be anchored. Adaptive ratio is recommended for those source-led workflows so the output does not fight the supplied shape.
The documented API limits include up to 10 reference images, up to five reference videos with a combined duration no greater than 15 seconds, and up to five reference-audio clips with a combined duration no greater than 15 seconds. File or web-page-to-video reference mode allows at most one file or one public web link. The guide also states that reference/file/link modes cannot be combined with first-frame or first-and-last-frame inputs in the same request.
These constraints belong to the documented Alibaba Cloud API and may change. Before uploading assets, check the current endpoint’s supported input types, file limits, duration limits, and whether a chosen mode excludes another mode. A rejected combination is usually fixed by selecting one reference strategy rather than attaching every available asset.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keeping characters and scenes coherent across shots
Continuity is easier when the prompt separates what must stay constant from what may change. Keep the character’s defining appearance, wardrobe, prop, and lighting direction identical in every beat. Change only the action, framing, or camera movement unless a deliberate transformation is part of the story.
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- Use the same reference label for the same character or object.
- Repeat distinctive attributes in each beat instead of replacing them with vague pronouns.
- Anchor the opening or closing frame when a transition must match an existing image.
- Limit the number of simultaneous subjects during a short shot.
- Check hands, faces, clothing patterns, and key props at each cut.
No official source establishes a universal success rate for identity persistence. These are planning practices that reduce ambiguity; inspect the generated frames and revise when continuity breaks.
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Common mistakes and practical fixes
The video is cropped for the destination
Cause: The prompt was composed in one ratio and repurposed for another. Fix: Generate in the destination ratio, keep critical content away from the edges, or use adaptive ratio with the final reference frame.
The subject leaves the frame
Cause: The action and camera movement conflict with the available width or height. Fix: Change a wide tracking move to a slower move, begin with a wider shot, or place the subject nearer the center before it starts moving.
Several actions happen at once
Cause: A short beat contains too many verbs or locations. Fix: Give the beat one dominant action, then allocate a separate 4–6 second segment to the next action.
Reference assets are rejected
Cause: The request exceeds count or duration limits, or combines incompatible modes. Fix: Reduce the assets to the documented maximum, keep reference-video and reference-audio totals within 15 seconds each, and choose either reference/file/link mode or first/last-frame mode where the API prohibits combining them.
The output size does not match the label
Cause: Resolution tiers are mapped differently by different providers, or explicit dimensions override a tier. Fix: Read the endpoint’s returned width and height and follow that provider’s table. Do not assume an example from one service is universal.
Dialogue or sound is distracting
Cause: Audio was requested without a clear role in the storyboard. Fix: Specify the speaker and time range, simplify the line, or disable generated audio and add a separately edited track.
Regional and implementation checks
Alibaba Cloud states that the model, endpoint, and API key must belong to the same region, and that exact supported models can vary by region. A button or parameter shown in one account may therefore be absent in another. Confirm the selected model name, endpoint region, resolution options, ratio list, and reference limits in the service you actually use.
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Also distinguish a documented capability from a guaranteed result. The specifications establish available modes, durations, ratios, frame rate, and input limits; they do not guarantee that every time-coded beat, camera move, facial detail, or sound cue will be reproduced exactly. Plan short iterations and reserve time for selection and editing.
A compact pre-generation checklist
- Is the final destination landscape, portrait, square, ultrawide, or reference-shaped?
- Does the selected ratio match the composition, with key content clear of the edges?
- Is the requested tier available in the chosen region and endpoint?
- Have you verified actual pixel dimensions rather than assuming a tier’s label?
- Does the total duration fall between 2 and 30 seconds, or is smart duration intentionally selected?
- Does each 4–6 second storyboard beat contain one main action?
- Does every beat specify framing and camera movement?
- Are references named, necessary, and within count and combined-duration limits?
- Are first/last-frame inputs kept separate from incompatible reference modes?
- Are dialogue, music, effects, and exclusions included only where they help?
Following this order—destination, ratio, resolution, duration, storyboard, references, then audio—turns Wan 3.0 generation into a manageable production plan rather than a trial-and-error block of adjectives.
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