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The /transcribe endpoint passed the raw uploaded file straight to the STT backend (mlx_audio.stt -> miniaudio), which only decodes WAV/FLAC/MP3/Vorbis. Browser recordings arrive as WebM/Opus (Chrome/Firefox MediaRecorder), so web-mode dictation failed with 500 "unsupported file format". The Tauri app was unaffected because WebKit produces MP4. librosa already fully decodes the upload to compute duration (falling back to audioread/ffmpeg for exotic containers), so re-encode that PCM to a temp WAV and hand it to Whisper. WAV inputs pass through unchanged; the temp file is cleaned up in the finally block. Co-authored-by: Claude Opus 4.8 <[email protected]>