Features: by frame extraction, each frame is saved as multiple pictures.

特点：按帧提取，每帧保存为多张图片。

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Now that we have a frame-by-frame extraction of our source video files, we can create tiled background images in sequence for each frame of the final product.

既然我们已逐帧提取出了源视频文件，对于最终产品的每一帧，我们可以按次序创建贴片的背景图像。

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To create our Mosaic video, we need a frame-by-frame extraction of all the source videos.

要创建马赛克视频，首先需要一帧一帧提取所有源视频。

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