Color changes when generating video

When I want to generate a long video, I try to generate multiple short videos and then splice them together, but I find that the color difference of the characters generated each time will change. For example, the person in my video becomes more and more red. What is the reason for this?

https://github.com/user-attachments/assets/2dec1c9a-c584-4c9a-b5ce-cb9bbc98b619

The issue names no repository file, test, or entry point. Start by reproducing the workflow of generating multiple short videos and splicing them together, then compare the character colors between clips. Done means identifying the cause of the progressive color change and recording a confirmed fix or explanation.

Written by the indexing model from the issue text.