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Basically, I want to convert an mp4 file that's in landscape to portrait. It's a single image on a black background with no sound. I want to keep the size and aspect ratio of the image intact and my plan is to convert it from 1280x720 to 720x1280.

I'm playing around with crop and padding, but I'm wondering if there's a way to get this done with one command, and if I need to reencode it.

Here's a screenshot of the video

  • Is the entire 1280x720 to be kept or is the area of interest smaller? A screenshot would help. – Gyan Sep 23 '16 at 18:17
  • Much smaller. I'll send a screenshot in a moment. – Smeegs Sep 23 '16 at 18:18
  • I've added a screenshot – Smeegs Sep 23 '16 at 18:23
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For a target size of 720x1280, you would use

ffmpeg -i img.png -vf scale=-1:1280:flags=lanczos,crop=720:1280:(iw-720)/2:0 out.png
  • Thanks, It looks like it only added the padding on top of the video, but that might actually work better for my needs. – Smeegs Sep 23 '16 at 18:40

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