Extrating a frame into image 

ffmpeg -i intput.mp4 -ss 00:00:00.000 -vframes 1 output.png

Scaling image

ffmpeg -i intput.png -vf scale=w:h output.png

where, w is width, h is height

Croping image

ffmpeg -i input.png -vf  “crop=w:h:x:y” output.png
where, w : width , h height , x and y are the left top coordinates of image

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