[BUG] 视频播放过程中导出视频，前几秒空白

### Platform

m1

### Browser

145

### Current Behavior

<img width="2530" height="1426" alt="Image" src="https://github.com/user-attachments/assets/1673b906-1bcb-40e5-8f0c-9058c1d9e452" />

### Expected Behavior

_No response_

### Recurrence Probability

Always

### Steps To Reproduce

必现

### Anything else?

_No response_