Videoveo3.1veo3.1-extend-video
Veo3.1 Extend Video
Veo 3.1’s Extend Video mode lets you continue or expand an existing video clip seamlessly. Starting from a short generated video, you can prompt the model to extend the scene—keeping visual style, characters, motion, and audio consistent. This model needs original task_id of the video.
Veo guideVerified
Google DeepMind's video model. The only major brand with **native audio generation** — voices, sound effects, music — synced to the video in one pass. Veo 3 Fast and Veo 3.1 are the workhorses.
Strengths
- Native audio: dialogue, foley, ambient sound rendered with the video. No separate lipsync pass needed.
- Strong physical realism — water, cloth, smoke behave plausibly.
- Veo 3.1 4K Video supports upscaling to 4K resolution.
- Fast tier is genuinely fast (sub-minute typical) while maintaining cinematic quality.
- Reliable adherence to camera direction (dolly-in, whip-pan, crane shots).
Weaknesses
- Stylized animation (anime, painterly) is weaker than realism — Veo is photographic by default.
- Audio quality varies; complex multi-voice scenes can muddle.
- Strict safety filters reject more prompts than competitors.
- Duration capped at 8s on Fast tier.
Best for
- Cinematic realism with audio (interviews, narration, dialogue scenes)
- Product demos / commercials where lip-synced voiceover matters
- Atmospheric scenes that benefit from ambient sound
- Quick drafts when speed > artistic flair
Avoid for
- Heavily stylized anime / painterly looks (try Kling, Seedance)
- Edgy or explicit content (will be filtered)
Prompting tips
- Audio direction: explicitly mention what should be heard ("man says 'hello'", "distant traffic hum").
- For dialogue, use plain English in quotes — Veo's audio engine speaks naturally.
- Camera moves: name them ("slow dolly forward", "crash zoom") — Veo respects them precisely.
- Keep prompts under ~150 words — Veo handles dense scene descriptions but rewards focus.
Parameter tips
- generate_audio: ON by default. Disable to save cost when you'll add audio in post.
- Aspect ratio: 16:9 is its native canvas; 9:16 quality dips slightly.
Parameters
- request_idstringRequest ID of the original video generation. Must be a valid Id returned from the video generation interface.