# inference.minimax.h3.fast.txt2vid.v1

Source: https://docs.prodia.com/job-types/inference-minimax-h3-fast-txt2vid-v1/

The `inference.minimax.h3.fast.txt2vid.v1` job generates a video with
synchronized stereo audio (1344×768, 24 fps, AAC 32 kHz) from a text prompt
using the MiniMax H3 (Hailuo-03) model. The `fast` tier is the fastest
option; outputs are equally coherent but not pixel-identical to `base` at
the same seed.

```json
{
    "type": "inference.minimax.h3.fast.txt2vid.v1",
    "config": {
        "prompt": "a red fox trotting through a snowy pine forest at golden hour"
    }
}
```

## Prompting

The prompt is used exactly as written: nothing rewrites or expands it before
it reaches the model, which was trained on descriptive captions. Describe
the shot rather than making a request: the subject, setting, time of day,
weather, lighting, camera move and motion. For example, "show me what
christmas would be like in Tokyo" tends to produce a generic winter scene,
while "Shibuya crossing in Tokyo on Christmas Eve at night, light snow
falling, crowds with umbrellas, a giant illuminated Christmas tree, neon
signs reflecting in the wet street, slow cinematic dolly shot" produces the
intended scene.

`duration` (whole seconds, 4–15), `aspect_ratio` (one of 16:9, 4:3, 1:1,
3:4, 9:16, 21:9; default 16:9) and `seed` can be set. Durations round
**up** to the model's frame grid (17n+5 frames at 24 fps): 4 s returns
4.46 s, 15 s returns 15.08 s, and values outside 4–15 fail validation. The
same seed reproduces the same video within a tier. `resolution` is accepted
for parity with other MiniMax job types, but only its default `768P` is
valid: this job type uses the 768P canvas preset, targeting a 768 px short
edge with a 768×1344 pixel area cap before rounding to multiples of 32.
Typical latency: roughly 29 s for a 6 s clip, \~91 s for a 15 s one.

```json
{
    "type": "inference.minimax.h3.fast.txt2vid.v1",
    "config": {
        "prompt": "a red fox trotting through a snowy pine forest at golden hour",
        "duration": 10,
        "seed": 42
    }
}
```

## Schema

```json
{
	"type": "object",
	"required": [
		"type",
		"config"
	],
	"additionalProperties": false,
	"properties": {
		"type": {
			"type": "string",
			"enum": [
				"inference.minimax.h3.base.txt2vid.v0",
				"inference.minimax.h3.fast.txt2vid.v0",
				"inference.minimax.h3.base.txt2vid.v1",
				"inference.minimax.h3.fast.txt2vid.v1",
				"inference.minimax.h3.turbo.txt2vid.v0",
				"inference.minimax.h3.hyper.txt2vid.v0",
				"inference.minimax.h3.chili.txt2vid.v0"
			]
		},
		"config": {
			"type": "object",
			"required": [
				"prompt"
			],
			"additionalProperties": false,
			"properties": {
				"prompt": {
					"type": "string",
					"minLength": 3,
					"maxLength": 7000,
					"default": "a dancing cat under moonlight",
					"description": "Description of the desired video and audio."
				},
				"duration": {
					"type": "integer",
					"minimum": 4,
					"maximum": 15,
					"default": 6,
					"description": "Duration of the video in seconds. Rounded up to the model's frame grid (4 s returns 4.46 s, 15 s returns 15.08 s)."
				},
				"aspect_ratio": {
					"type": "string",
					"enum": [
						"16:9",
						"4:3",
						"1:1",
						"3:4",
						"9:16",
						"21:9"
					],
					"default": "16:9",
					"description": "Controls the approximate aspect ratio of the resulting video."
				},
				"resolution": {
					"type": "string",
					"enum": [
						"768P"
					],
					"default": "768P",
					"description": "Only 768P is supported: the canvas targets a 768px short edge with a 768x1344 pixel area cap and 32px rounding; exact width and height follow the selected aspect ratio."
				},
				"seed": {
					"type": "integer",
					"minimum": 0,
					"maximum": 2147483647,
					"description": "Seed for reproducible generation. Random when omitted."
				}
			}
		}
	}
}
```