This guide is intended for customers who need to caption multiple audio tracks within the same video stream.

A common example is a live event where the primary audio is being translated by an on-site interpreter. Each language audio feed can be captioned independently and then made available within the same stream.

It’s only available with the Player plugin output.

How it works

Multi-track captioning works by creating multiple linked Timbra projects, with each project configured to transcribe a different audio track from the same HLS stream.

One project acts as the parent project, while the additional projects act as sub-projects for the other audio tracks. Captions generated by the sub-projects are automatically surfaced within the parent project.

Setting up multi-track audio

Once multi-track audio has been enabled, you can create additional audio track projects from the parent project.

1. Open the project menu
2. Select Duplicate for multi-track
3. Configure the new project to use the appropriate audio track
4. Change the source language to the language of the audio track

This creates a linked sub-project. Any captions generated by the sub-project are automatically pulled into the parent project.

Usage notes

• Each project must be started individually
• Each project must be stopped individually
• Ensure that only one language is configured as Player default
• All linked projects should be configured before the event begins to ensure a consistent viewer experience