An H3 Max 422 error means the request could not be accepted as submitted. It does not, by itself, prove that the prompt violated a safety rule. The same HTTP status can carry a content-policy rejection, an image problem, or another validation error. The useful clue is the message shown with it.
On AI Live Generator, a provider rejection is a failed task, not a completed video. Credits reserved for that task are returned when the failure is recorded. If the site rejects an invalid setting before it creates a task, no credits are reserved in the first place.
Do not solve every 422 by disguising words. First identify which part of the request failed.
Read the error, not just the number
The current interface turns provider errors into a smaller set of messages that are safe to display. Here is what each one asks you to change:
| Message or error type | What it means on this site | Useful next action |
|---|---|---|
| Content policy violation | The provider reported a safety, NSFW, or content-policy signal | Change the underlying scene so it is compliant; do not obfuscate the same request |
| Reference image is too small | The supplied frame did not meet the provider's usable-image requirement | Upload a larger, clearer source image |
| No media generated | The model returned no playable video for the accepted input | Simplify the shot and remove conflicting instructions before trying again |
| Request could not be processed | The 422 did not match a more specific category | Check the prompt, images, duration, resolution, and mode |
| Generation failed | The job reached another terminal failure state | Wait for the refund, then decide whether a changed input is worth another request |
fal's current H3 Max Turbo API schema exposes enable_safety_checker, enabled by default. fal also describes automated multimodal moderation in its Trust & Safety overview. That explains why a request can be refused before a video appears. It does not mean every validation error is moderation.
Was the prompt actually rejected for safety?
If the message specifically says the prompt or image violates the content policy, treat the creative premise—not one isolated word—as the problem.
A common bad response is to keep the same intent and swap spelling, euphemisms, or punctuation until a filter stops recognizing it. That is not prompt improvement. It is an attempt to bypass a safety system, and it still leaves you with a scene you should not submit.
Instead, ask what the shot is supposed to achieve. If the brief relies on a deceptive depiction of an identifiable person, replace that premise with an original fictional character and remove the false endorsement. For example:
Five-second medium shot of a fictional adult product designer in an original
studio, not resembling any real person. The designer places a small desk lamp
on the table and says once: “The hinge is the whole idea.” Keep the face visible
through the line, fixed eye-level camera, warm practical light. Audio: one clear
voice, a soft metal click, and quiet room tone; no music or additional speakers.This is an untested editorial example, not a guaranteed output. Its value is the decision behind it: preserve the product-demo job while removing a misleading identity claim.
If the original goal itself is prohibited, there may be no compliant rewrite that keeps the goal. Choose a different scene.
A generic 422 is usually an input diagnosis
When the message says only that the request could not be processed, check the controls the site actually sends. AI Live Generator currently accepts:
- a non-empty prompt of no more than 2,000 characters;
- a whole-number duration from 5 to 15 seconds;
- 480P or 768P output;
- Balanced or Quality prompt expansion;
- one of six aspect ratios for text-to-video;
- a first image for image-to-video, plus an optional ending image.
The server validates those choices again even if the browser form looked correct. That protects an old tab or a manually altered request from submitting an unsupported combination.
For image-to-video, replace the source rather than endlessly editing the prompt when the error identifies the image. Use a clean, reasonably sized frame that can be fetched after upload. Our image-to-video guide covers composition and first-frame preparation; the motion troubleshooting guide is for a video that completed but moved badly, which is a different problem.
A failed result is not the same as a rejected submission
There are three distinct moments in the workflow:
- Local validation: the site rejects an unsupported or incomplete request before reserving credits.
- Provider submission: the site reserves the displayed amount, sends the job, and may receive a structured 422 immediately.
- Queued generation: the provider accepts a task ID, then later reports success or a terminal failure through status polling or a signed webhook.
In the second and third cases, the task can already have a credit reservation. When AI Live Generator marks that task as failed, it atomically cancels the consumption record and restores the reserved amount. The operation is guarded so a webhook and a browser status check cannot refund the same task twice.
A temporary status-check error is different. If the task is still pending or processing, the site has not established that generation failed. Avoid opening another tab and submitting an identical job simply because one status request timed out. Check My Videos or refresh the existing task first.
The H3 Max cost guide explains the current per-second credit calculation. A policy rejection does not become a paid success just because credits were briefly reserved.
Fix one layer, then try once
Use this order before spending another attempt:
- Copy the displayed error category, not the original provider response.
- Confirm whether a task appears in My Videos and whether it is failed, pending, or processing.
- For a policy message, replace the non-compliant premise. Do not hide it.
- For an image message, replace the image with a larger, clean source.
- For a generic validation message, reselect the mode, duration, resolution, and expansion setting in a fresh page.
- For “no media generated,” reduce the brief to one subject, one visible action, one camera instruction, and one sound priority.
- Check the restored balance before submitting again.
This sequence keeps a safety problem from becoming a technical guessing game, and it keeps an ordinary image error from looking like a policy accusation.
If the credits still look wrong
The refund happens when the task reaches the site's failed state. A balance displayed in an already-open page can be stale, so refresh the account state after the failure appears. If the task is failed and the balance still does not reflect the returned reservation, keep the task time, mode, duration, and resolution for support. Do not include passwords, API keys, or payment details.
For a completed clip that merely missed the creative brief, credits are not automatically returned just because you dislike the result. That is a generation-quality problem. Revise one variable using the negative-prompt alternatives or the broader H3 Max prompt guide, then decide whether the new attempt answers a clear question.
The dividing line is simple: a rejected or failed task produced no usable video, while a weak completed take is still a completed generation. The status and message tell you which problem you actually have.
Product behavior checked October 5, 2026 against this site's current validation, fal error-classification, task-refund code, and fal's public H3 Max Turbo and Trust & Safety documentation. Provider schemas and policies can change.