Test: ran the code and checked for ffmpeg functionality

src/transcriber.py

@@ -102,14 +102,12 @@ class Transcriber:
             logger.exception("Failed to save transcript: %s", e)
             raise
 
-    def _clear_memory(self):
+    @staticmethod
+    def _clear_memory():
         """
         Clear GPU memory.
         """
         try:
-            del self.transcription_model
-            del self.alignment_model
-            del self.metadata
             gc.collect()
             torch.cuda.empty_cache()
         except Exception as e: