无论是用第三方导入的视频，和后台直接上传的视频的四周都有圆角，请问怎么设置取消？

原视频是没有圆角的。

预览链接：

https://mp.weixin.qq.com/s?__biz=MzAxOTIwNjA2Mw==&tempkey=MTE4NV9VNzE4aGRXbFJDVjA2OUs2Z1lhRWFQeVhsLXlhN01pTVQ5eFE4SzVLQTV4dTJqWnF5M2JEM3luWnhtZzdVV0JsRXdMOFEzTkZGRGtvLUpLdldIWVhuVGh4M09rUGlINWdwUG5Nc1h5QkJzbkszRlhMYUtKSmVoa1dpUnN3aWc5YWhYS2UxTkJLcmphZTlwWEJCMEhoMVRhbFh3eHg3RTZERWRDLTF3fn4%3D&chksm=1bcbdf202cbc5636a211f0eda864f4771c87cae3cdcd5be1329c148974378c41a52d0c2da812#rd