Each example is a complete POST /v1/renders body. Only fields that differ from their defaults are shown. See the element field reference for every default.
For text and image elements, duration is required — the API returns 422 if it is missing. video and audio elements have no duration field — use out_point to control clip length. volume must be greater than 0 — the renderer silently drops audio streams with volume ≤ 0.
Background audio
A separate audio track over a video. volume: 0 on the video mutes its embedded audio so only the audio track is heard.
Trim audio source
Play only seconds 30–36 of the source file.
Repeat audio
Repeat a 6-second clip to cover a 12-second render. Add one element per repeat with a different time and the same in_point/out_point.
Fade in and out
Fade audio in over 0.5 seconds and out over 1 second.
Lower volume
Mix audio at 50% volume alongside the video’s embedded audio.
