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H3 Max Turbo Extend Video

All video to video models

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.

Inference$ Commercial useFrom 2 credits per run

About H3 Max Turbo Extend Video

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.

extendvideocontinuation

Pricing

A run with the default settings costs 2 credits. The exact cost updates in the playground as you change settings, and you're only charged when you press Run. Failed runs are refunded automatically.

Inputs

video_urlfilerequired

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.

prompttextarearequired

What happens next. Describe the continuation, not the source.

reference_audio_urlsfile-list

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. Assign each clip a role in the prompt, such as 'Audio 1 for the voice' and 'Audio 2 for background music'.

enable_prompt_expansionbooleandefault: true

Automatically enhance the prompt using the source video to help keep the continuation consistent. May increase processing time.

durationnumberdefault: 5

Seconds of new footage to add. The continuation clip also includes 1.625 seconds from the source's ending and may be longer because of frame rounding.

resolutionselectdefault: "768P"

Output video resolution.

Options: 480P, 768P

aspect_ratioselectdefault: "auto"

Output aspect ratio. 'auto' follows the source video. Other values crop the video to fit the selected ratio.

Options: auto, 21:9, 16:9, 4:3, 1:1, 3:4, 9:16

seedinteger

Seed for the continuation. Random when omitted.

outputselectdefault: "extended"

'extended' returns the source and new footage as one video. 'continuation' returns a clip that starts with a 1.625-second repeat of the source's ending, then shows the new footage.

Options: extended, continuation

enable_safety_checkerbooleandefault: true

Moderate the source video and the prompt.

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