diff --git a/backend/src/api/routes/library.py b/backend/src/api/routes/library.py
index f5e020c..d116cea 100644
--- a/backend/src/api/routes/library.py
+++ b/backend/src/api/routes/library.py
@@ -41,6 +41,9 @@ def find_audio_files(directory: str) -> list[Path]:
         return []
 
     for root, dirs, files in os.walk(directory_path):
+        # Skip transcoded and waveforms directories
+        dirs[:] = [d for d in dirs if d not in ['transcoded', 'waveforms', '.transcoded', '.waveforms']]
+
         for file in files:
             file_path = Path(root) / file
             if file_path.suffix.lower() in AUDIO_EXTENSIONS:
diff --git a/backend/src/cli/scanner.py b/backend/src/cli/scanner.py
index 7b1e475..e3ffc72 100644
--- a/backend/src/cli/scanner.py
+++ b/backend/src/cli/scanner.py
@@ -46,6 +46,9 @@ def find_audio_files(directory: str) -> List[Path]:
     logger.info(f"Scanning directory: {directory}")
 
     for root, dirs, files in os.walk(directory_path):
+        # Skip transcoded and waveforms directories
+        dirs[:] = [d for d in dirs if d not in ['transcoded', 'waveforms', '.transcoded', '.waveforms']]
+
         for file in files:
             file_path = Path(root) / file
             if file_path.suffix.lower() in AUDIO_EXTENSIONS: