AI background music for a one-minute video: brief and cost

Brief the music for a one-minute video with section markers, generate it for $0.125, and render it under the video with Timeline for $0.10 per output minute. That is $0.225 in total for a one-minute piece, assuming the render bills at the per-minute rate.

Cost build-up

Brief it

Match sections to the edit: a quiet intro for a title, a lift at the product shot, a resolve for the call to action. Ask for an instrumental so it does not fight a voiceover.

curl -X POST https://api.sume.com/v1/music-router/generate \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: bgm-minute-001" \
  -d '{
    "model": "sume/music-auto",
    "prompt": "Confident upbeat corporate pop, 112 BPM, C major. [0:00-0:10] Intro: soft pulse. [0:10-0:40] Build: bright keys, light drums. [0:40-0:55] Lift: full band. [0:55-1:00] Out: clean ending. Instrumental, no vocals."
  }'

Why the render is separate

Music Router returns the song; Timeline puts it under the video. Keeping them apart lets you swap the track without paying for another generation of the video.

Notes

• The length is steered by the prompt; check the artifact before rendering.
• Render max is 1,800 seconds per output.
• Captions are a separate call, $0.20 for videos up to 60 s.
• Reuse an Idempotency-Key when retrying to avoid a second bill.