The specific content of a DSA (Direct School Admission) Chinese dance interview may vary depending on the school and program. However, typically, the interview may consist of several components, including:

1. Dance skills demonstration: Applicants may be required to demonstrate their dance skills during the interview. The school will usually provide information on what skills will be assessed during the interview.

2. Interview questions: The school may ask applicants questions about their dance experience, motivation, and goals. They may also ask questions to assess the applicant's character and suitability for the program.

3. Written tests: Depending on the school, applicants may be required to take a written test that assesses their knowledge of Chinese dance, culture, and history.

4. Group dance: Applicants may be required to participate in a group dance session, where they will be assessed on their ability to work with others, follow instructions, and perform as part of a team.

Regarding the dance skills demonstration, if you have already submitted a video of your dance performance, it is possible that you may not need to re-perform during the interview. However, the school may request that you demonstrate specific skills or perform a different routine during the interview.

It is best to check with the school or program directly for more specific information on what to expect during the interview.