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ffmpeg上传视频获取第一帧用作封面,如何确定视频封面尺寸

我们需要在富文本种上传视频,但是视频尺寸是不固定的,但是通过ffmpeg截取的时候,需要确认尺寸,改怎么设置呢?


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ffmpeg取一帧图片怎么会需要尺寸呢?
ffmpeg -ss 00:01:01 -i video.mp4 image.jpg


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