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Hedrahedra-character-3
hedra-character-3 is an audio to video tool from Hedra that runs in the background and returns video. Pay as you go from $0.0325 per second, with one API key.
Try itfrom $0.0325 / second
Pricing
resolution: 540p $0.0325, 720p $0.065, 1080p $0.08125 per second. Billed on duration_ms, or measured from the audio file, rounded up. The final charge comes from usage.
Limits
- Runs
- In the background
- Returns
- video
- Longest queue wait
- 3600s
- Run deadline
- 3600s
- Largest inline input
- 1024 KB
- Largest input file
- 500 MB
- Largest output
- 4768 MB
- Outputs per run
- 1
Input
| Field | Kind | Default | Description |
|---|---|---|---|
audio required | JSON | — | Driving audio, a single speaker: `{"source": "url", "url": "https://…"}`, 0.5 s to 600 s and at most 104.8 MB. The video runs as long as the audio. |
prompt required | text | Generate a realistic talking avatar video with lip sync | Generation prompt. |
resolution required | one of 540p, 720p, 1080p | 720p | Output resolution. |
start_image required | JSON | — | Start frame (the face to animate): `{"source": "url", "url": "https://…"}`. At most 10.4 MB. |
aspect_ratio required | one of 1:1, 4:3, 3:4, 16:9, 9:16, 9:21, 21:9 | 9:16 | Output aspect ratio. |
duration_ms | number (whole) … to 600000 | — | Duration in ms. At most 600000. |
bounding_box_target | JSON | — | Speaker position in the start frame, as normalized [x, y] image coordinates (0-1 from the top-left); selects who speaks in a frame with several people. |
Same request in code
curl https://api.spiral.ai/v1/runs \
-H "Authorization: Bearer $SPIRAL_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $(uuidgen)" \
-d '{
"provider": "hedra",
"model": "hedra-character-3",
"input": {
"audio": {},
"prompt": "Generate a realistic talking avatar video with lip sync",
"resolution": "720p",
"start_image": {},
"aspect_ratio": "9:16"
}
}'