fix: add video format detection for uploaded files in image.py

Author: wxg0103

apps/models_provider/impl/volcanic_engine_model_provider/model/image.py

@@ -25,9 +25,19 @@ def new_instance(model_type, model_name, model_credential: Dict[str, object], **
     def is_cache_model():
         return False
 
-
     def upload_file_and_get_url(self, file_stream, file_name):
         """上传文件并获取文件URL"""
         base64_video = base64.b64encode(file_stream).decode("utf-8")
-        video_format = mimetypes.guess_type(file_name)[0]
+        video_format = get_video_format(file_name)
         return f'data:{video_format};base64,{base64_video}'
+
+
+def get_video_format(file_name):
+    extension = file_name.split('.')[-1].lower()
+    format_map = {
+        'mp4': 'video/mp4',
+        'avi': 'video/avi',
+        'mov': 'video/mov',
+        'wmv': 'video/x-ms-wmv'
+    }
+    return format_map.get(extension, 'video/mp4')