视频开始时，画面中是一片红色的背景。随后，从左侧逐渐出现了一条白色的竖条纹，这条竖条纹占据了画面左侧的一部分区域。接着，在白色竖条纹和红色背景的交界处，出现了一个锯齿状的图案，这个图案将白色和红色分隔开来。整个过程中，背景颜色保持不变，只有白色竖条纹和锯齿状图案逐渐显现出来。
The video shows a flag with a red background. A white vertical stripe appears on the left side of the flag, and then a serrated edge forms along the boundary between the red and white sections. The flag remains static after the serrated edge is fully formed.
The video starts with a solid red background. Gradually, a white vertical stripe begins to appear on the left side of the red background. The white stripe continues to move upward, becoming more prominent. As the white stripe reaches the top of the red background, a serrated edge starts to form at the bottom of the white stripe. The serrated edge continues to extend upward, completing the pattern.