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sjwilliams/gist:4b23f60fc451e7e8c59e

Created May 2, 2014 17:45
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FFmpeg: Blur video
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gistfile1.sh
ffmpeg -i intro.mov -vf "boxblur=5:1" intro-blur.mov
@SreenikethanI
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Thanks for this!

@jackyhieu1211-hn
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Hello . what is the mean 5:1 ?

@hraban
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hraban commented Nov 10, 2019 •
edited

@hieuseesaa as far as I understand https://ffmpeg.org/ffmpeg-filters.html#boxblur and from tinkering with it: the 5 is the pixel radius of the (gaussian?) blur effect, while the 1 is the amount of consecutive frames to apply the blur to. increasing the 5 will make it blurrier. Increasing the 1 will make it choppier (not "smoothed out", as you might expect from e.g. a moving average).

@jackyhieu1211-hn
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@hraban thank you very much

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ghost commented Oct 5, 2021

  • default values: -vf boxblur === -vf boxblur=luma_radius=2:luma_power=2.
  • blur just a part of the frame: -vf boxblur=w=20:h=20:x=400:y=200.
  • blur just for a few seconds of the video's timeline (example: 00:00:03-00:10:00) -vf boxblur=enable='between(t,3,10*60)'.
  • combine those freely, order is not important (: to separate arguments, = to specify value).
  • f.y.i, enable is available for any filter! (when it makes sense, not much for crop, for example..).

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