During November 2025, Yaogang focused on improving video preprocessing reliability in the huggingface/transformers repository, specifically targeting the Qwen2 and Qwen3 video processors. He addressed a temporal padding alignment bug that previously caused misalignment when the number of frames did not match the temporal patch size, refining the video processing logic to handle diverse frame counts and patch sizes. Using Python and unit testing, Yaogang enhanced test coverage by adding targeted cases for critical padding scenarios, streamlined test workflows for faster feedback, and improved maintainability across code paths. His work strengthened stability and correctness in production video model pipelines.