Troubleshoot an event

Timbra automatically detects some issues that may need a closer look, or require a manual intervention.

The caption processing encountered an error. This can be an infrastructure issue or an issue with the source stream. If this happens, the system performs a full automatic restart.

The system restarts the processing at most 5 times.

Your media server may have stopped emitting HLS segments or the segments are delayed by caching (note the captioning will stop automatically if no new segments appear for 60 seconds).

It’s also possible the live processing has encountered issues.

The recommendation is to restart the captioning process.

A discontinuity in the HLS stream can cause sync issues between the audio and the captions.

The recommendation is to restart the captioning process.

If the system detects a timing mismatch, we can’t guarantee sync between the audio and the captions.

The recommendation is to restart the captioning process.

Our transcription engine reports a confidence score for the transcripts it produces. Clear audio typically results in a transcript with a confidence of 0.95 to 0.99.

An alert is displayed if the rolling average confidence of the transcript for the last 60 seconds drops below 0.9. Possible causes of low confidence transcript can include speech in a non-source language, music, or degraded audio.

The transcription engine has stopped returning transcripts, or is being delayed. This doesn’t happen under normal conditions. If this affects the display of captions, the recommendation is to restart the stream.

If the issue persists, the recommendation is to switch to the fallback transcription service.

Your encoder is connected, but the stream it is sending has no audio tracks, so there is nothing to transcribe. This applies to RTMP and SRT projects. Check that your encoder is sending audio.

The project is set to transcribe a specific audio PID, but the stream doesn’t have it. The message lists the PIDs the stream does have audio on. Change PID for audio stream under Advanced options in Edit project to one of these. See Select the audio track for transcription.

One of the project’s translation languages can’t be translated from the source language, so it won’t receive captions. Remove it from the translation languages in Languages & settings.