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Fix: keep the uploaded file extension when transcribing #903

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Fix: keep the uploaded file extension when transcribing #903

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9 changes: 8 additions & 1 deletion backend/routes/transcription.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,10 @@

UPLOAD_CHUNK_SIZE = 1024 * 1024 # 1MB

# Same set profiles.py accepts for voice samples. librosa picks its decoder from the
# file extension, so the temp file has to keep the uploaded one.
ALLOWED_AUDIO_EXTS = {".wav", ".mp3", ".m4a", ".ogg", ".flac", ".aac", ".webm", ".opus"}


@router.post("/transcribe", response_model=models.TranscriptionResponse)
async def transcribe_audio(
Expand All @@ -23,7 +27,10 @@ async def transcribe_audio(
model: str | None = Form(None),
):
"""Transcribe audio file to text."""
with tempfile.NamedTemporaryFile(suffix=".wav", delete=False) as tmp:
uploaded_ext = Path(file.filename or "").suffix.lower()
file_suffix = uploaded_ext if uploaded_ext in ALLOWED_AUDIO_EXTS else ".wav"

with tempfile.NamedTemporaryFile(suffix=file_suffix, delete=False) as tmp:
while chunk := await file.read(UPLOAD_CHUNK_SIZE):
tmp.write(chunk)
tmp_path = tmp.name
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