ECHO-488 update options for transcription

[spashii]

Summary by CodeRabbit

• New Features
  • Improved language detection with configurable fallback: auto-detected language now defaults to English when unspecified, or uses the selected language as fallback for more accurate transcriptions.
• Bug Fixes
  • Clearer, more consistent error messages during transcription failures, improving troubleshooting and reliability.

[linear]

ECHO-488 Switch to AssemblyAI with circuit breaker to change model to Whisper if needed

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Adjusts AssemblyAI transcription request to use language_detection with expanded options and fallback_language logic; updates logging and raised error formatting in transcribe_conversation_chunk. No public API changes.

Changes

Cohort / File(s)	Summary of changes
Transcription payload & logging echo/server/dembrane/transcribe.py	Switched to top-level language_detection: True with expanded language_detection_options.expected_languages and fallback_language selection (auto→en or specific language). Replaced language_code usage. Updated logger.error and TranscriptionError messages to use parameterized formatting instead of f-strings.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• ECHO-261-route-english-transcription-through-litellm #171 — Also modifies transcribe_conversation_chunk, focusing on transcription routing and RunPod status handling.
• updates #295 — Adjusts AssemblyAI integration in the same file, overlapping on language handling and logging/error behavior.

Suggested labels

Feature

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-transcription-language-options

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📥 Commits

Reviewing files that changed from the base of the PR and between 541061c and 280f6e1.

📒 Files selected for processing (1)

• echo/server/dembrane/transcribe.py (2 hunks)

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Bug: Audio Transcription Language Detection Issue

The transcribe_audio_assemblyai function now unconditionally enables language detection. This means a specified language is used only as a fallback, altering the expected behavior of directly forcing a language. Additionally, if language is None, detection is enabled without a fallback, which may cause API errors.