Naver Clip video: a 9:16 Sume clip with Korean captions

Generate the source clip vertical (9:16) and add Korean captions after generation. On Sume that is two calls: a video job with aspect_ratio set to a vertical value the model lists, then a caption job with style: "korean-ad" and language: "ko". Confirm Naver's current format rules on its own pages first.

Check Naver's rules

Format and monetization rules for Naver Clip are set by Naver and can change. This post does not restate them; confirm the current requirements on the Naver Clip page before you plan a campaign.

Step 1: a vertical clip

Ask GET /v1/videos/models which aspect ratios each model supports in supported_aspect_ratios; the documented example for seedance-2 lists 9:16. Limits are per model, for example seedance-2.5 accepts 4 to 30 seconds. Submit with Idempotency-Key so a retry returns the original job.

curl -X POST https://api.sume.com/v1/videos \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: naver-clip-001" \
  -d '{
    "model": "seedance-2",
    "prompt": "A vertical UGC-style product clip on a desk, natural light",
    "aspect_ratio": "9:16",
    "resolution": "720p",
    "duration": 8
  }'

Step 2: Korean captions that fit

Latin caption styles have no Hangul glyphs. Sume rejects Korean copy sent to slam, punch or tiktok-green with a 400 rather than drawing tofu boxes. For Korean speech use a Hangul style. korean-ad is the ad karaoke look: one short phrase at a time in the lower third, with the spoken word shifting to a heavy weight.

The clip needs audible speech for speech-to-captions. A silent clip fails as caption_no_speech; pass cues with text, start and end to burn authored copy instead.

curl -X POST https://api.sume.com/v1/video-captions \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: naver-clip-captions-001" \
  -d '{
    "video_url": "https://media.sume.com/artifacts/example/clip.mp4",
    "style": "korean-ad",
    "language": "ko"
  }'

Cost and limits to remember

A standalone caption job reserves and captures $0.20 USD for videos up to 60 seconds under the current fixed estimate; confirm live pricing in GET /v1/catalog. The video_url must be a public HTTPS URL, so use the Sume artifact URL from the first job. font is optional and only valid on Hangul styles.

Posting is outside Sume

Sume generates and captions the clip. Uploading to Naver, and anything attached to it there, happens inside Naver's tools, outside the API.