Exam review Short: show the question, then reveal the answer with cues

An exam review Short that reveals the answer needs only three things: a background, a question cue that appears first, and an answer cue that appears later. In Sume, render a plain background still into a silent Timeline 1.0 clip, then run Video captions with two or three timed cues. The answer reveal is just a cue that starts after the question cue has had time to be read. Each captioned Short costs $0.20 for a video up to 60 seconds (Sume docs, read 2026-10-03).

Time the reveal for reading, not for effect

Viewers need time to read and think. A short question needs about as long on screen as it takes to read it aloud once, then a pause before the answer. Pick the pause yourself; Sume does not measure it. Cue times are seconds from the start.

Build it

Timeline 1.0 needs audio and at least one video[] slot. Use audio: { mode: "silence", duration_seconds: 15 } and one slot with your background image as source_url and duration: 15; stills are static holds. Then submit the output as video_url to POST /v1/video-captions with the cue list. Cues skip speech-to-text, which matters here because there is no speech.

``json { "video_url": "https://media.sume.com/artifacts/artf_demo/quiz-bg.mp4", "cues": [ { "text": "Which organelle makes most of a cell's ATP?", "start": 0, "end": 7 }, { "text": "The mitochondrion", "start": 7, "end": 12 } ] } ``

Check the facts

The cue text is whatever you send, so a wrong answer is burned in faithfully. Review each answer before publishing a set, and keep the background plain enough that the cue stays readable.