Omni video edit on Sume: the 8-second default holds $1.00 at 720p

When you send video_url to gemini-omni-flash-1.1 on Sume, the output length comes from your source clip, and the hold placed on your wallet uses an 8-second hint unless you send duration. At 720p that hold is 8 x $0.125 = $1.00.

Sume's docs state this directly: fal does not return an output duration for an edit, so the reserve is a hint, not a measurement of your clip.

What the docs say about edit and duration

In edit mode, Sume sends no aspect_ratio and no duration to the provider, and aspect_ratio returns a 400 if you include it. If you send a duration together with video_url, it is only the reserve-estimate hint, and the default is 8 seconds.

resolution is optional and defaults to 720p. The edit also refuses generate_audio: false, bitrate_mode and reference_audio_urls, because the model always produces native synced audio.

The hold at each resolution

Omni's provider list is $0.10, $0.15 and $0.30 a second at 720p, 1080p and 4K. Sume bills list x 1.25, which is $0.125, $0.1875 and $0.375. Multiply by your hint to get the hold.

The table shows the hold for a few hints at 720p and 1080p. I did not find the way the final capture is computed in the repo docs, so read usage.cost on the finished job, and treat the numbers below as the amount your wallet must have free at submit.

Send the hint that matches your clip

If your source clip is 4 seconds, add duration: 4 so the hold reflects the clip, not the 8-second default. It will not change the output length, because the source decides that. It changes only the estimate.

A batch of 50 five-second edits at the default hint holds 50 x $1.00 = $50.00 at submit, while a batch with duration: 5 holds 50 x $0.625 = $31.25 (each job rounded up to $0.63, so $31.50 in practice).

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-edit-hint-001" \
  -d '{"model":"gemini-omni-flash-1.1","prompt":"Replace the bottle with an apple. Keep everything else the same.","video_url":"https://example.com/clip.mp4","duration":5,"resolution":"720p","mode":"async"}'

Limits to remember

Omni is 3 to 10 seconds, so a longer source is outside the model's range. Check your clip length before you submit. The edit is only on the Video Router surface, not on the OpenRouter-shaped /v1/videos body, and sume/auto does not route to it unless you send video_url.

For prompts that work well for edits, see the car color edit and adding fireworks.

Before you queue a batch

Run one edit, read the finished job's usage.cost, and compare it with the hold. Then size the wallet for the batch from the real number.

• Send duration that matches the source to keep the hold honest.
• Use a unique Idempotency-Key for each edit.
• Keep the source under 10 seconds.
• Do not send aspect_ratio, generate_audio: false or reference_audio_urls.