What is FLUX 3 Video Extend?

It continues an existing video clip with new prompt-guided motion and scene development, using Black Forest Labs' unified image/video/audio architecture.

What are the source video requirements?

The source clip must be an MP4 under 50 MB and under 15 seconds long.

Does the extension keep native audio?

Yes, synchronized native audio for the extended portion can be toggled with `generate_audio` at no extra charge.

How long can an extension be?

5 to 20 seconds, billed rounded up to the next whole second.

How much does FLUX 3 Video Extend cost?

Muapi bills $0.25/second at 720p and $0.42/second at 1080p for the extended portion, rounded up to the next whole second, capped at 20 seconds.

Can I chain multiple extensions together?

Yes — feed the output of one extension back in as the `video_url` of the next call to keep building a longer sequence.

Back to Comparison Hub/FLUX 3 Video Extend Pricing

Video to Video

FLUX 3 Video Extend API Pricing

Continue any video clip with prompt-guided motion and native audio using FLUX 3 Video Extend by Black Forest Labs. Try free — pay per generation.

Savings Alert-733% ↓Cheaper than Fal.ai

About FLUX 3 Video Extend

FLUX 3 Video Extend continues an existing video clip with prompt-guided motion, scene development, and camera movement — with optional native synchronized audio — using Black Forest Labs' unified image/video/audio architecture. It's the way to chain [FLUX 3 Text to Video](/playground/flux-3-text-to-video) or [FLUX 3 Image to Video](/playground/flux-3-image-to-video) outputs into longer sequences, or continue any existing MP4 clip under 50 MB and 15 seconds. Once extended, run the result through [FLUX 3 Video Upscaler](/playground/flux-3-video-upscaler) for a higher-resolution final pass.

Interactive Savings Calculator

Estimate monthly API spend and compare absolute developer savings.

Monthly API Generations10,000 runs

50025,00050,00075,000100,000+

MuAPI Monthly Cost

$2500.00

$0.25/sec (720p), $0.42/sec (1080p)

Fal.ai Cost

$300.00

Not available

Estimated Monthly Savings$-2200.00

Annual Savings$-26400.00

Detailed Pricing Breakdown

Provider	Estimated Rate	Notes
muapiapp	$0.25/sec (720p), $0.42/sec (1080p)	Pay-per-generation pricing, no subscription required. Audio generation included at no extra charge.
Fal.ai	Not available	FLUX 3 Video Extend is not yet listed on Fal.ai.
Replicate	Not available	FLUX 3 Video Extend is not yet listed on Replicate.

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