Update app.py

app.py

@@ -112,6 +112,8 @@ def replace_image_with_base64(markdown_text, image_dir_path):
 
 def to_markdown(file_path, end_pages, is_ocr, layout_mode, formula_enable, table_enable, language):
     file_path = to_pdf(file_path)
+    if end_pages > 20:
+        end_pages = 20
     # 获取识别的md文件以及压缩包文件路径
     local_md_dir, file_name = parse_pdf(file_path, './output', end_pages - 1, is_ocr,
                                         layout_mode, formula_enable, table_enable, language)