[FFmpeg-user] which blur filter should I use?

[Lou]

On Mon, 25 Nov 2013 01:41:19 -0600
Lingyuan Wang <lwanghpc at gmail.com> wrote:

> I'd like to downscale my video, 2160p to 1080p for example, which
> pre-bluring filter should I use?

Why do you want to blur before scaling?

>  I understand ffmepg provides boxblur and smartblur.

There is also sab and unsharp.

http://ffmpeg.org/ffmpeg-filters.html#sab
http://ffmpeg.org/ffmpeg-filters.html#unsharp