Sentence segments from video inspect: caption lines with no gaps

Set segmentation.mode: "sentence" on a Sume video inspect call with transcribe: true, and the result includes sentence segments[] with no gaps, in the shape of caption lines. You can also set silence_split_seconds between 0.2 and 3 to split on pauses. Those segments map straight onto the cues field of the video captions API, which burns text you supply without running speech-to-text again.

Transcript options

Price

The public STT rate is $0.01 per audio minute (STT_PUBLIC_PRICING), added to the inspect's compute reservation. A 5-minute clip is 5 x $0.01 = $0.05 of STT line cost, and the maximum 600 s hint is 10 x $0.01 = $0.10. Sume captures each inspect at its own container seconds, times Modal list, times 1.25, plus the platform fee, never more than the hold. For scale, Microsoft states $0.54 per hour of audio for MAI-Transcribe-2-Streaming through the end of the year (read 2026-10-08), which is $0.09 for 10 minutes; the two are different products and Sume does not list the Microsoft model.

Errors to expect

Sending language_code, segmentation or duration_seconds without transcribe: true returns 400 video_inspect_transcribe_required. A silent clip with transcribe: true fails with inspect_source_has_no_audio; probe has_audio first with frames: false.

Feeding captions

Take each segment's text, start and end and send them as cues to POST /v1/video-captions. A standalone caption job costs $0.20 for clips up to 60 seconds under the current estimate. You pay once for the transcript and once for the render, and you control the words in between, which is a good place to fix brand names.

curl -X POST https://api.sume.com/v1/video-inspect \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: inspect-sentences-001" \
  -d '{
    "video_url": "https://media.sume.com/artifacts/artf_demo/talk.mp4",
    "transcribe": true,
    "language_code": "en",
    "segmentation": { "mode": "sentence" },
    "duration_seconds": 300
  }'