TikTok pop-out showcase: 8 s minimum, 3 s in, 5 s tail

A TikTok pop-out showcase needs a video of at least 8 seconds, and the pop-out can appear only 3 seconds after the ad starts and at least 5 seconds before it ends. TikTok suggests more than 15 seconds. That leaves a visible window of video length minus 8 seconds, so an 8 s ad has zero seconds of window and a 15 s ad has 7.

What TikTok's page says

Figures below come from the TikTok Ads Help page for the interactive add-on pop-out showcase.

The window, by length

The earliest start is 3 s and the latest end is length minus 5 s, so the pop-out window is length minus 8 s long. This is arithmetic on TikTok's two numbers, not a TikTok figure.

Cut a clip to fit with Sume

If your product moment lands at second 6 of a longer clip, start the cut about 3 s earlier so it falls inside the window. Video trim cuts one Sume-hosted clip to a new MP4 with start and duration. Duration can run 0.2 to 900 s and the documented rate is $0.02 per job. The default exact precision is a frame-accurate re-encode, so your timing holds.

Here a 16 s cut starts at 12 s of the source, which gives a 3 s to 11 s window.

curl -X POST https://api.sume.com/v1/video-trim \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: popout-cut-001" \
  -d '{
    "video_url": "https://media.sume.com/artifacts/artf_demo/launch.mp4",
    "start": 12,
    "duration": 16
  }'

Verify the length

Read duration_seconds in the job result (GET /v1/jobs/:id/result). It must be at least 8 and, per TikTok's suggestion, preferably above 15. Use video inspect to probe any clip's duration before you submit it as the ad.

What this does not cover

The page gives no aspect ratio or file-size rule for the video itself, and Sume does not build the 448x448 pop-out element or the CTA. Check the ad-format page for the placement you buy for those.