def screenshot_youtube_video(youtube_id, snapshot_sec):

app.py

@@ -216,6 +216,7 @@ def process_youtube_link(link):
 
     formatted_transcript = []
     screenshot_paths = []
+    download_youtube_video(video_id, output_path=OUTPUT_PATH)
     for entry in transcript:
         start_time = format_seconds_to_time(entry['start'])
         end_time = format_seconds_to_time(entry['start'] + entry['duration'])
@@ -273,9 +274,7 @@ def download_youtube_video(youtube_id, output_path=OUTPUT_PATH):
     print(f"Video downloaded successfully: {output_path}/{youtube_id}.mp4")
 
 
-def screenshot_youtube_video(youtube_id, snapshot_sec):
-    # 先下載 video
-    download_youtube_video(youtube_id, output_path=OUTPUT_PATH)
+def screenshot_youtube_video(youtube_id, snapshot_sec):    
     # 这里假设视频已经在适当的位置
     video_path = f'{OUTPUT_PATH}/{youtube_id}.mp4'