In some videos there zoomed part of the same video instead of black bars. Like this one: enter image description here

1 Answer 1


Let's say your final canvas resolution is WxH, then you would run

ffmpeg -i video -filter_complex "[0]scale=W:H,boxblur=15:15,setsar=1[bg];[bg][0]overlay=(W-w)/2:(H-h)/2" -c:a copy out.mp4
  • I can't understand how to use it: I'm getting wrong parameters error, could you explain better, in instance about w and h.
    – Jack J
    Jun 23, 2018 at 20:42
  • You should replace W and H with the actual numbers for output width and height. The first filter rescales the input to WxH and blurs it. Then the original unscaled input is overlaid on top.
    – Gyan
    Jun 24, 2018 at 5:12
  • I'm getting errors: Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument. Log file: drive.google.com/open?id=1QDbe115rjPTtcixXtQzm4qUb3Qx5S3FU
    – Jack J
    Jun 24, 2018 at 16:04
  • 1
    Remove -c:a copy
    – Gyan
    Jun 24, 2018 at 16:09
  • 1
    You're using a very old version. -strict -2 hasn't been required since 3.0. Current ver is 4.0.1
    – Gyan
    Jun 25, 2018 at 5:01

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