AI time-lapse video prompt for Gemini Omni Flash on Sume

For a time-lapse in Gemini Omni Flash 1.1, name a locked-off camera, one subject that changes over time, and the light that shifts, then ask for a single continuous shot. Google's Omni guide lists these building blocks but does not describe a time-lapse mode, so test the wording at 360p and treat the speed of change as something the model chooses.

Sources: Google DeepMind's Omni prompt guide, the Gemini API Omni docs and Google's Omni 1.1 Flash build post, all read on 2026-10-03. Output is 3 to 10 seconds, so a time-lapse here is short by design.

Ingredients from Google's guide

Pair a fixed camera ("static", "locked off", "fixed") with a continuous-shot phrase to avoid cuts, then describe the light source and its quality, since light is what carries the passage of time: dawn to full sun, or dusk to street lamps.

A prompt that avoids the traps

Say what changes and in which direction: "clouds move quickly left to right while the light shifts from soft dawn to bright midday". Avoid asking for people to move naturally in a time-lapse; fast crowd motion is a hard case and Google lists no guarantee for it. Do not include on-screen clocks, because rendered text may drift.

Draft at 360p first

Google's build post calls 360p a draft mode: up to 60% faster and one-third the cost of 720p. Send the draft, watch it, then rerun the winning prompt at 720p.

curl -X POST https://api.sume.com/v1/video-router/generate \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: omni-timelapse-001" \
  -d '{
    "model": "gemini-omni-flash-1.1",
    "prompt": "In a single continuous shot, locked off, a city skyline from a rooftop. Clouds race quickly left to right while the light shifts from soft dawn to bright midday. Natural ambient city sound.",
    "resolution": "360p",
    "duration": 6,
    "aspect_ratio": "16:9",
    "mode": "async"
  }'

Speeding up real footage instead

If you have real footage and want it faster, that is a different job. Sume has no speed control in its trim surface, which a related post covers. Use Omni when you want a generated time-lapse, and see the Video Router docs for the request fields.