Live streams may contain multiple audio tracks, and you can select which audio track to use. If you want to transcribe multiple audio tracks, refer to the multi-track audio feature.

HLS source

By default, Timbra uses the primary audio track from the HLS stream as the source for transcription.

If you would like Timbra to transcribe a different audio source, you can configure a dedicated transcription stream. To do so, open your live project, select More actions ⋯ > Edit project, expand Advanced options, and specify the HLS transcription URL.

You’ll need to restart the captioning process to pick up the captions.

RTMP/SRT source

If your RTMP or SRT contains multiple audio streams, you can provide a Packet Identifier (PID) to select the audio track to transcribe.

Use cases

You can use this feature to:

• Select the source language in a multilingual stream
• Select the correct audio track in a stream with multiple encoding variants or backups
• Select a non-default audio track, for example an audio track without music, or the Audio Description track
• Fail over to a backup audio stream