A 15-second Omni ad: two clips, one fade, what it costs

Gemini Omni Flash 1.1 makes clips of 3 to 10 seconds, so a 15-second ad is two clips, for example 10 s plus 5 s, joined by a transition. On Sume the Omni clips cost $1.25 plus $0.625 at 720p, and a Timeline render adds $0.10 for the one billable minute, about $1.98 in total. Google's per-second Omni price, about $0.10, puts the footage alone at about $1.50, but it offers no assembly step.

The cost table

Omni limits and price come from Google's Omni guide and pricing page. Sume figures use the list times 1.25 rule on the Video Router page and the $0.10 per output minute rate on the Timeline page.

Build the join

Timeline takes ordered video[] slots with start and duration, and a transition on every slot after the first. A fade of 0.5 seconds fits the rule that a transition is at most 1 second and at most 50 percent of the shorter neighbour. Declared starts are authoritative, so set the second slot's start at 10 and let the compiler handle the overlap.

The audio side is required: pass an audio.url spine of 15 seconds, or silence mode (audio.mode set to silence) if you add sound later. I did not find a statement on whether source-clip audio is kept, so test a render.

Before you pay

Call POST /v1/timeline-1.0/plan first; it is unbilled and returns billable_minutes and estimated_cost_usd_micros. A 15 second render reserves one minute. Keep the total under 60 seconds and the Timeline stays at one minute; one second past it doubles the bill.