中文说明：从视频中提取关键帧，以若干张图片替代视频关键内容。
English Description：
The key frame is extracted from the video, and several pictures are used to replace the key content of the video.
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中文说明：从视频中提取关键帧，以若干张图片替代视频关键内容。
English Description：
The key frame is extracted from the video, and several pictures are used to replace the key content of the video.