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This will create a feature request which anybody can view and comment on.

Please describe your requested enhancement. Good feature requests will solve common problems or enable new use cases.

What you would like to accomplish: Get a more specific error message compared to this error when using log-form audio.[2]

How this might work: Pinpoint, the root cause of the error[1] to minimize troubleshooting time and avoid multiple retries to locate issue within the file.

If applicable, reasons why alternative solutions are not sufficient: Current alternative is to check manually on the file to check for issues and retry running the request which incurs more charges and is not a practical workaround for files with multiple pages.

[1] google.api_core.exceptions.InternalServerError: 500 INTERNAL: [type.googleapis.com/util.ErrorSpacePayload='SpeechErrorSpace::TTS_BACKEND_REQUEST_RPC_ERROR'] 13: INTERNAL: [type.googleapis.com/util.ErrorSpacePayload='SpeechErrorSpace::TTS_BACKEND_REQUEST_RPC_ERROR']
[2] https://cloud.google.com/text-to-speech/docs/create-audio-text-long-audio-synthesis