diff --git a/index_for_search.py b/index_for_search.py
index 36149ba..3d6a010 100755
--- a/index_for_search.py
+++ b/index_for_search.py
@@ -101,6 +101,10 @@ def updatefileindex():
                 relative_path = os.path.join(foldername, rel_part).replace(os.sep, '/')
                 filetype = os.path.splitext(entry.name)[1].lower()
                 
+                if filetype not in ['.mp3', '.wav', '.ogg', '.m4a', '.flac']:
+                    # Skip non-audio files.
+                    continue
+                
                 # Retrieve the hit count for this file.
                 hit_count = get_hit_count(relative_path)
                 
@@ -111,68 +115,66 @@ def updatefileindex():
                     site = 'Speyer'
                 elif foldername == 'Gottesdienste Schwegenheim':
                     site = 'Schwegenheim'
-                
-                if filetype == '.mp3':
 
-                    # Check for a corresponding transcript file in a sibling "Transkription" folder.
-                    parent_dir = os.path.dirname(entry_path)
-                    transcript_dir = os.path.join(parent_dir, "Transkription")
-                    transcript_filename = os.path.splitext(entry.name)[0] + ".md"
-                    transcript_path = os.path.join(transcript_dir, transcript_filename)
-                    if os.path.exists(transcript_path):
-                        try:
-                            with open(transcript_path, 'r', encoding='utf-8') as tf:
-                                transcript = tf.read()
-                        except Exception:
-                            transcript = None
-
-                    # extract category and titel from filename
-                    filename_ext = os.path.splitext(entry.name)[0]
-                    left_side, right_side = filename_ext.split('-', 1) if '-' in filename_ext else (filename_ext, None)
+                # Check for a corresponding transcript file in a sibling "Transkription" folder.
+                parent_dir = os.path.dirname(entry_path)
+                transcript_dir = os.path.join(parent_dir, "Transkription")
+                transcript_filename = os.path.splitext(entry.name)[0] + ".md"
+                transcript_path = os.path.join(transcript_dir, transcript_filename)
+                if os.path.exists(transcript_path):
                     try:
-                        int(left_side.strip())
-                        # first part is only a number
-                        previous_right_side = right_side
-                        left_side, right_side = previous_right_side.split('-', 1) if '-' in previous_right_side else (previous_right_side, None)
-                    except:
-                        # first part not a number
-                        pass
-                    
-                    if 'predig' in left_side.lower():
-                        category = 'Predigt'
-                    elif 'wort' in left_side.lower() or 'einladung' in left_side.lower():
-                        category = 'Vorwort'
-                    elif 'chor' in left_side.lower():
-                        category = 'Chor'
-                    elif 'orchester' in left_side.lower():
-                        category = 'Orchester'
-                    elif 'gruppenlied' in left_side.lower() or 'jugendlied' in left_side.lower():
-                        category = 'Gruppenlied'
-                    elif 'gemeinsam' in left_side.lower() or 'gesang' in left_side.lower() or 'lied' in left_side.lower():
-                        category = 'Gemeinsamer Gesang'
-                    elif 'gedicht' in left_side.lower():
-                        category = 'Gedicht'
-                    elif 'instrumental' in left_side.lower() or 'musikstück' in left_side.lower():
-                        category = 'Instrumental'
-                    else:
-                        category = None
+                        with open(transcript_path, 'r', encoding='utf-8') as tf:
+                            transcript = tf.read()
+                    except Exception:
+                        transcript = None
 
-                    if right_side:
-                        titel, name = right_side.split('-', 1) if '-' in right_side else (right_side, None)
-                        if category == 'Predigt' or category == 'Vorwort' or category == 'Gedicht':
-                            if not name: # kein Titel, nur Name
-                                name = titel
-                                titel = None
-                    else:
-                        titel = None
-                        name = None
+                # extract category and titel from filename
+                filename_ext = os.path.splitext(entry.name)[0]
+                left_side, right_side = filename_ext.split('-', 1) if '-' in filename_ext else (filename_ext, None)
+                try:
+                    int(left_side.strip())
+                    # first part is only a number
+                    previous_right_side = right_side
+                    left_side, right_side = previous_right_side.split('-', 1) if '-' in previous_right_side else (previous_right_side, None)
+                except:
+                    # first part not a number
+                    pass
+                
+                if 'predig' in left_side.lower():
+                    category = 'Predigt'
+                elif 'wort' in left_side.lower() or 'einladung' in left_side.lower():
+                    category = 'Vorwort'
+                elif 'chor' in left_side.lower():
+                    category = 'Chor'
+                elif 'orchester' in left_side.lower():
+                    category = 'Orchester'
+                elif 'gruppenlied' in left_side.lower() or 'jugendlied' in left_side.lower():
+                    category = 'Gruppenlied'
+                elif 'gemeinsam' in left_side.lower() or 'gesang' in left_side.lower() or 'lied' in left_side.lower():
+                    category = 'Gemeinsamer Gesang'
+                elif 'gedicht' in left_side.lower():
+                    category = 'Gedicht'
+                elif 'instrumental' in left_side.lower() or 'musikstück' in left_side.lower():
+                    category = 'Instrumental'
+                else:
+                    category = None
+
+                if right_side:
+                    titel, name = right_side.split('-', 1) if '-' in right_side else (right_side, None)
+                    if category == 'Predigt' or category == 'Vorwort' or category == 'Gedicht':
+                        if not name: # kein Titel, nur Name
+                            name = titel
+                            titel = None
+                else:
+                    titel = None
+                    name = None
                     
-                # extract the date from path using regex (dd.mm.yyyy or dd.mm.yy)
-                date_match = re.search(r'(\d{1,2}\.\d{1,2}\.\d{2,4})', relative_path)
+                # extract the date from path using regex (supports YYYY.MM.DD, DD.MM.YYYY or DD.MM.YY)
+                date_match = re.search(r'(\d{1,2}\.\d{1,2}\.\d{2,4}|\d{4}\.\d{2}\.\d{2})', relative_path)
                 if date_match:
                     date_str = date_match.group(1)
                     performance_date = None
-                    for fmt in ('%d.%m.%Y', '%d.%m.%y', '%Y-%m-%d'):
+                    for fmt in ('%Y.%m.%d', '%d.%m.%Y', '%d.%m.%y', '%Y-%m-%d'):
                         try:
                             date_obj = datetime.strptime(date_str, fmt)
                             # Convert to ISO format YYYY-MM-DD