added end time to youtube clip playback

ai_config_faiss.py

@@ -90,7 +90,11 @@ class FAISSAIAssistant:
         for i, doc in enumerate(filtered_docs, 1):
             metadata = doc['metadata']
             st_ts = timestamp_to_seconds(metadata['start_timestamp'])
-            yt_url = f"https://youtu.be/{metadata['youtube_id']}?t={st_ts}"
+            end_ts = timestamp_to_seconds(metadata['end_timestamp'])
+            end_url = "" if end_ts == 0 else f"&end={end_ts}"
+
+            yt_url = f"https://youtube.com/embed/{
+                metadata['youtube_id']}?start={st_ts}&{end_url}&autoplay=1&rel=0"
 
             speaker_info = (
                 f"Speaker: {metadata.get('speaker', 'Unknown')}, "