Resolve Cloud Presentations subtitles: burn cues into a copy

Blackmagic says Cloud Presentations in DaVinci Resolve 21.1 gained subtitle support. Sume does not touch that feature; what it offers for a review copy is burned-in captions: POST /v1/video-captions draws cues onto a video, and SRT uploads are unsupported, so pass the text as cues.

Vendor facts are from the 21.1 announcement; Sume facts from Video captions, read 2026-10-01.

What did Resolve 21.1 add to Cloud Presentations?

The announcement says Blackmagic Cloud Presentations has been updated with subtitle support, annotation sharing and comment replies, to make collaboration with clients on review and approval easier. It gives no more detail than that sentence, so this post does not describe how it works.

How do I make a reviewable copy with subtitles in Sume?

Standalone captions burn text onto an existing public HTTPS video URL. If you already have the wording, send cues (or segments) with text, start and end in seconds. The docs say that overlay path skips speech-to-text.

The words are then part of the pixels: the viewer cannot switch them off, so keep the clean version too.

curl -X POST https://api.sume.com/v1/video-captions \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: review-cues-001" \
  -d '{
    "video_url": "https://media.sume.com/artifacts/example/clean.mp4",
    "style": "punch",
    "cues": [
      { "text": "Review copy, v2", "start": 0, "end": 2.5 },
      { "text": "Logo moves left", "start": 2.5, "end": 5 }
    ]
  }'

Can I upload an SRT file?

No. The docs state that SRT uploads and provider task ids are unsupported, and tell you to pass phrase-level text as cues or segments instead. Convert the SRT lines to text, start and end yourself; the three fields are the whole shape.

What does it cost and how long can the video be?

The docs say each accepted standalone caption job reserves and captures $0.20 USD of Sume usage for videos up to 60 seconds under the current fixed estimate, and tell you to confirm live pricing in GET /v1/catalog and OpenAPI.

What if the clip has no speech?

Without cues, a silent clip fails as caption_no_speech. Passing cues avoids that; see silent clips and overlay cues. For the difference between burned-in text and a sidecar file, read captions vs subtitles.