Embed Subtitles

Mux a subtitle file into the video container as a soft subtitle track that viewers can toggle on or off.

API Endpoint

POST /api/v1/tools/embed-subtitles

Accepts multipart form data with a video file and a subtitle file, plus a JSON settings field.

Parameters

Parameter	Type	Required	Default	Description
language	string	No	"eng"	ISO 639-2/B language code (3 lowercase letters, e.g. "eng", "fra", "deu")

Example Request

curl -X POST http://localhost:1349/api/v1/tools/embed-subtitles \
  -H "Authorization: Bearer si_your-api-key" \
  -F "[email protected]" \
  -F "[email protected]" \
  -F 'settings={"language": "fra"}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/clip.mp4",
  "originalSize": 12500000,
  "processedSize": 12520000
}

Notes

• Upload two files: the first must be a video, the second must be a subtitle file (.srt, .vtt, or .ass).
• Embedded (soft) subtitles can be toggled by the viewer in their media player. For permanently visible subtitles, use the Burn Subtitles tool instead.
• The language code is stored as metadata in the container and helps media players label the subtitle track.