Boba Video
  • Getting Started
    • What is Boba Video?
    • Quickstart
  • Video Generation
    • Models
    • Text to Video
    • Image to Video
    • Subject Reference
    • Extend Video
    • First-Last Frame
    • Boba Mode
  • Image Generation
    • Models
    • LoRAs
    • Upscaling
  • Speech Generation
    • Lip Sync
  • Other
    • Prompt Optimization
    • How Credits Work
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On this page
  • Extend Video Guide
  • 1. Mode Selector
  • 2. Add Reference Video
  • 3. Settings Panel
  • 4. Prompt Box
  • 5. Monitoring Your Job
  • 6. Post-Processing Controls
  1. Video Generation

Extend Video

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Last updated 10 days ago

Extend Video Guide

The Extend Video (EXT) tab lets you seamlessly lengthen or continue an existing clip using AI.

1. Mode Selector

At the top, choose your generation mode:

  • T2V (Text → Video)

  • I2V (Image → Video)

  • SR (Subject Reference)

  • EXT (Extend Video)

  • F-L (First Frame → Last Frame)

Tip: Select EXT to build onto your reference video.

2. Add Reference Video

  1. Click Select or Upload Video (or drag-and-drop).

  2. Upload your base clip—the AI will use its last frame as the starting point for extension.

3. Settings Panel

Keep defaults for a smooth experience or fine-tune:

Setting
Description

Model

Choose an extension-capable engine (e.g. Hailuo Base, Hailuo Live, WAN 2.1, Runway Gen4, etc.). Each shows runtime and credit cost.

Number of Videos

Generate 1–5 extended variations in one batch. (Default = 1)

Generate Sound

Toggle on to auto-add sound effects (5 extra credits)

Aspect Ratio

Select framing for your extension: • 16:9 (widescreen) • 9:16 (vertical) • 1:1 (square)

4. Prompt Box

Describe how the new segment should play out:

  1. Type your extension direction (e.g. “Continue panning right to reveal a sunset”).

  2. Optimized Tag appears if prompt optimization is active.

  3. Credit Counter shows the cost for extending your clip.

  4. Send (↑) Button starts the extension process.

  5. Clear (🗑️) Icon resets the instructions.

5. Monitoring Your Job

After sending, view your extension in the Generation Feed:

  • Progress Bar & Percentage

  • Mode Tag & Model Name

  • Timestamp

Hover for a quick preview or click to open full-screen.

6. Post-Processing Controls

Hover over your finished extension to access:

  • Add to Library: Save to Assets

  • Download: Export to your device

  • Upscale: Increase resolution (2K → 4K) using credits

  • Smooth Motion: Apply frame interpolation for fluid playback

  • Delete: Remove the generation (with confirmation)

With Extend Video, you can grow your story beyond the initial clip—just upload your video, describe the continuation, and watch AI do the rest!