diff --git a/scripts/iib/api.py b/scripts/iib/api.py
index 575185e..30f8091 100644
--- a/scripts/iib/api.py
+++ b/scripts/iib/api.py
@@ -642,6 +642,8 @@ def infinite_image_browsing_api(app: FastAPI, **kwargs):
                     "Cache-Control": "no-store",
                 },
             )
+        if not is_media_file(path):
+            raise HTTPException(status_code=400, detail=f"{path} is not a video file")
         # 如果缓存文件不存在，则生成缩略图并保存
         
         import imageio.v3 as iio
diff --git a/scripts/iib/db/datamodel.py b/scripts/iib/db/datamodel.py
index ea3ed75..e76e9e4 100644
--- a/scripts/iib/db/datamodel.py
+++ b/scripts/iib/db/datamodel.py
@@ -266,22 +266,27 @@ class Image:
     
     @classmethod
     def get_random_images(cls, conn: Connection, size: int) -> List["Image"]:
+        images = []
+        max_cyc = 10
+        curr_cyc = 0
         with closing(conn.cursor()) as cur:
-            cur.execute("SELECT COUNT(*) FROM image")
-            total_count = cur.fetchone()[0]
+            while len(images) < size and curr_cyc < max_cyc:
+                curr_cyc += 1
+                cur.execute("SELECT COUNT(*) FROM image")
+                total_count = cur.fetchone()[0]
 
-            if total_count == 0 or size <= 0:
-                return []
+                if total_count == 0 or size <= 0:
+                    return []
 
-            step = max(1, total_count // size)
+                step = max(1, total_count // size)
 
-            start_indices = [random.randint(i * step, min((i + 1) * step - 1, total_count - 1)) for i in range(size)]
-
-            placeholders = ",".join("?" * len(start_indices))
-            cur.execute(f"SELECT * FROM image WHERE id IN ({placeholders})", start_indices)
-            rows = cur.fetchall()
-
-        images = [cls.from_row(row) for row in rows if os.path.exists(row[1])]
+                start_indices = [random.randint(i * step, min((i + 1) * step - 1, total_count - 1)) for i in range(size)]
+                placeholders = ",".join("?" * len(start_indices))
+                cur.execute(f"SELECT * FROM image WHERE id IN ({placeholders})", start_indices)
+                rows = cur.fetchall()
+                curr_images = [cls.from_row(row) for row in rows if os.path.exists(row[1])]
+                images.extend(curr_images)
+                images = unique_by(images, lambda x: x.path)
         return images
 
 
diff --git a/scripts/iib/tool.py b/scripts/iib/tool.py
index 618bb9c..8c5cf80 100755
--- a/scripts/iib/tool.py
+++ b/scripts/iib/tool.py
@@ -13,7 +13,8 @@ import json
 import zipfile
 from PIL import Image
 import shutil
-
+# import magic
+import filetype
 
 sd_img_dirs = [
     "outdir_txt2img_samples",
@@ -200,6 +201,11 @@ def convert_to_bytes(file_size_str):
     else:
         raise ValueError(f"Invalid file size string '{file_size_str}'")
     
+
+def is_video_simple(filepath):
+    kind = filetype.guess(filepath)
+    return kind and kind.mime.startswith('video/')
+
 def get_video_type(file_path):
     video_extensions = ['.mp4', '.m4v', '.avi', '.mkv', '.mov', '.wmv', '.flv', '.ts']
     file_extension = file_path[file_path.rfind('.'):].lower()
@@ -218,7 +224,7 @@ def is_image_file(filename: str) -> bool:
     return f".{extension}" in extensions
 
 def is_video_file(filename: str) -> bool:
-    return isinstance(get_video_type(filename), str)
+    return isinstance(get_video_type(filename), str) and is_video_simple(filename)
 
 def is_valid_media_path(path):
     """