[FFmpeg-user] Using ffmpeg to blur moving objects

[Boris T]

Hello,

Thanks for the reply.

An example use case of what I'm trying to do is to blur faces in a video.
I've already managed to detect the areas I want to blur, now I'm trying to
find the most efficient way of doing it.

When using this type of command:
[0:v]crop=160.00:160.00:94.40:96.00,boxblur=10[
step0];[0:v][step0]overlay=94.400:96.00:repeatlast=0:enable=
'between(t,0.073,7.55839409433962)'[step0_overlay];

The first part:
[0:v]crop=160.00:160.00:94.40:96.00,boxblur=10[step0]
creates the blur over a 100 x 100 area of the video.

And then the second part:
[0:v][step0]overlay=94.400:96.00:repeatlast=0:enable='between(t,0.073,7.
55839409433962)'[step0_overlay]
applies it.

I assume what you're suggesting Cley is to have a completely separate tool
do the blurring?

Thanks!





On Tue, Nov 1, 2016 at 3:40 AM, Cley Faye <cleyfaye at gmail.com> wrote:

> 2016-10-31 15:23 GMT+01:00 Boris T <boris.t.richard at gmail.com>:
>
> > Yes, I already have the moving objects' coordinates (x, y values, the
> box's
> > width and height, as well as the duration of the blur). I only need to
> use
> > ffmpeg to blur that object in the video according to the provided
> > coordinates. I have a working solution, but it becomes very slow the more
> > blurred overlays I have.
> >
>
> ​I am not sure I'm getting the whole picture of what you're doing, but if
> you have a lot of blurring to do on each frames, maybe a script that output
> each video frames into another tool doing the blur, which in turns output
> into a second ffmpeg process for transcoding could avoid you a cascade of
> overlays.
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