Introduction

A practical guide to using Google Veo 3.1 Fast in our Media Generator: options, credits per duration/audio, prompt tips, and best practices.

Google Veo 3.1 Fast is Google’s fast text-to-video model. In our platform, it supports:

• Text-to-video — Generate video from prompts (no image required)
• 4, 6, or 8 seconds — Short clips
• 720p and 1080p — Resolution choice
• Generate audio — Optional AI-generated soundtrack (costs more)
• Negative prompt — Exclude unwanted elements
• 16:9, 9:16 aspect ratios

Use it when you want Google’s quality with flexible duration and resolution.

Where to Use Veo 3.1 Fast

| Location | How | |----------|-----| | Media Generator | Tools → Media Generator → Video tab → select "Google Veo 3.1 Fast" | | Image-to-video projects | Create a project and select Veo 3.1 Fast for video generation |

Platform Options

Duration

| Option | With audio | Silent | |--------|------------|--------| | 4s | 1.50 | 1.00 | | 6s | 2.25 | 1.50 | | 8s | 3.00 | 2.00 |

Default:

• 6s

Resolution

| Option | Use case | |--------|----------| | 720p | Faster, lower cost | | 1080p | Higher quality |

Default:

• 1080p

Note: Cost is per-second; resolution does not change the rate. Shorter duration = lower cost.

Aspect ratio

| Option | Best for | |--------|----------| | 16:9 | Landscape | | 9:16 | Portrait, Stories |

Default:

• 16:9

Generate audio

• On (default) — $0.15/sec
• Off — $0.10/sec (lower cost)

Negative prompt

• Optional text to exclude elements from the video
• E.g. “blurry, low quality, watermark”

Costs (credits)

Veo 3.1 Fast uses per-second pricing by audio:

| Audio | USD/sec | 4s | 6s | 8s | |-------|---------|----|----|-----| | On | $0.15 | 1.50 | 2.25 | 3.00 | | Off | $0.10 | 1.00 | 1.50 | 2.00 |

\*Credits computed with default billing config. Check the model selector for current rates.

Prompt Guidelines

Do

• Describe clear action — “camera pans across landscape”
• Specify visual style — “cinematic,” “vibrant”
• Use negative prompt — Exclude blur, watermarks, unwanted style
• Mention lighting — “golden hour,” “soft light”

Avoid

• Vague or abstract prompts
• Conflicting instructions
• Very long descriptions

Tips & Tricks

1. 4s for tests — Shortest and cheapest option.
2. Turn off audio for drafts — Save ~33% (0.10 vs 0.15/sec).
3. Negative prompt — “low quality, blurry, text” helps filter issues.
4. 6s default — Balance of length and cost.
5. 1080p for final — Use 720p when speed matters more.

Limits and Constraints

| Constraint | Value | |------------|-------| | Durations | 4s, 6s, 8s | | Resolutions | 720p, 1080p | | Aspect ratios | 16:9, 9:16 | | Reference image | Not required |

Troubleshooting

| Issue | What to try | |-------|-------------| | Unwanted elements | Use negative prompt | | Cost too high | Use 4s and/or silent | | Model not available | Confirm Replicate API token is configured | | Inconsistent quality | Add more specific style and lighting terms |