able to re-transcribe

backend/services/transcription.py

@@ -48,11 +48,11 @@ def _load_model(model_name: str, device: torch.device):
         compute_type = "float16" if device.type == "cuda" else "int8"
         model = whisperx.load_model(
             model_name,
-            device=str(device),
+            device=device.type,  # use "cuda" not "cuda:0" — some WhisperX versions don't support device ordinal
             compute_type=compute_type,
         )
     else:
-        model = whisper.load_model(model_name, device=device)
+        model = whisper.load_model(model_name, device=str(device))
 
     _model_cache[cache_key] = model
     return model
@@ -112,7 +112,7 @@ def _transcribe_whisperx(model, audio_path: str, device: torch.device, language:
 
     align_model, align_metadata = whisperx.load_align_model(
         language_code=detected_language,
-        device=str(device),
+        device=device.type,
     )
     aligned = whisperx.align(
         result["segments"],