[FFmpeg-user] Blur the Background with a Gradient

[Qianliang Zhang]

May just use boxblur. Because I don not want to make a gradient for every
different size.


On Sat, Aug 23, 2014 at 5:28 AM, Lou <lou at lrcd.com> wrote:

> On Fri, 22 Aug 2014 17:42:01 +0800
> Qianliang Zhang <zhangqianliang at gmail.com> wrote:
>
> > Hi everyone,
> >
> > I try blur video with 'boxblur' filter, and I find it helpful. But I want
> > to blur my video with a gradient, any advice?
>
> Make a gradient that is the same size as your input video:
>
> $ convert -size 640x480 gradient: gradient.png
>
> Then use ffmpeg (untested example):
>
> $ ffmpeg -i video.mkv -loop 1 -i gradient.png -filter_complex \
>   "[0:v]boxblur[blur]; \
>    [blur][1:v]alphamerge[merged]; \
>    [0:v][merged]overlay[out]" \
>   -map "[out]" output.mkv
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