Such an error occurred during the cutout process. It looks like the edges are at odds with the background. By turning off part of the node check, I came to the conclusion because I used a single-frame photo for the test first, and then replaced the photo as a video after the test. But I only replaced part of the footage. This is why the following problem occurs。
![](https://c19011002.myblog.arts.ac.uk/wp-content/plugins/lazy-load/images/1x1.trans.gif)
Sometimes the background is still there because of forgetting to change the attributes of the merge node.
![](https://c19011002.myblog.arts.ac.uk/wp-content/plugins/lazy-load/images/1x1.trans.gif)