Add Caption Track to Asset

Add Caption Track to Asset

Works with AI assistants

Create a ready asset, add a text caption track, and wait for the track to be ready.

1. Create a new asset from the source URL so a caption track can be attached once it is ready.
2. Poll the asset until its status reaches ready so a track can be added.
3. Attach a text caption track to the ready asset, pointing Mux at the external caption file to download.
4. Re-read the asset until the newly added caption track reports a ready status in the asset's tracks list.

What you'll need to have ready

• inputUrl: A publicly accessible URL to the source video file Mux should ingest.
• captionUrl: URL of the SRT or WebVTT caption file Mux should download and attach.
• languageCode: BCP 47 language code for the caption track (e.g. en or en-US).
• trackName: Human readable name for the caption track.

For your developer

Arazzo workflow mux-com:asset-add-caption-track, 4 operations: createAsset → getAsset → create-asset-track → getAsset. Specs on APIs.io.