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Extend an existing video with H3 Max Turbo: add 1 to 15 seconds of prompt-guided footage, with optional audio references and output resolutions from 480p to 2K.
Example
Details
- Accepts
- video + audio
Pricing
- Price
- 3.13 cr / second
Prices in credits (1 credit = $0.01).
Data schema
Input
| Field | Type | Description |
|---|---|---|
| seed | — | Seed for the continuation. Random when omitted. |
| output | stringenum: extended, continuation | 'extended' returns the whole source video followed by the new footage. 'continuation' returns only the generated continuation. |
| promptrequired | string | What happens next. Describe the continuation, not the source. |
| duration | number | Seconds of new footage to add after the source. The actual duration may be slightly longer. |
| video_urlrequired | string | URL of the video to extend. Must be 1.625 s to 60 s long, up to 50 MB, aspect ratio between 0.4 and 2.5. |
| resolution | stringenum: 480P, 768P, 1080P, 2K | Output video resolution. |
| aspect_ratio | stringenum: auto, 21:9, 16:9, 4:3, 1:1, 3:4… | Output aspect ratio. 'auto' follows the source video. Other values crop the video to fit the selected ratio. |
| reference_audio_urls | array | Optional audio references for the continuation (2–15 seconds each, 15 seconds combined). The full extended video retains its original source soundtrack, and its ending still conditions the transition. These clips guide the newly generated audio instead of using that soundtrack as an audio reference.… |
| enable_safety_checker | boolean | Moderate the source video and the prompt. |
| enable_prompt_expansion | boolean | Automatically enhance the prompt using the source video to help keep the continuation consistent. May increase processing time. |
Output
| Field | Type | Description |
|---|---|---|
| seed | integer | Seed used for the continuation. |
| video | — | The extended video, or only the continuation per 'output'. |
| source | object | Source video information: width, height, frame rate, duration, and audio. |
| timings | object | |
| duration | number | Seconds of returned video. |
| expanded_prompt | — | The prompt used after expansion, or null when unchanged. |