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

[Lou]

On Mon, 25 Nov 2013 04:37:32 -0600
Lingyuan Wang <lwanghpc at gmail.com> wrote:

> Depends on the original material and how sharp it is, generally
> low-pass pre-blurring is a common practice, otherwise the result could
> be filled with ugly edges.

See the -sws_flags scaler option to set the scaling algorithm
(bilinear, bicubic, lanczos, etc):

http://ffmpeg.org/ffmpeg-scaler.html#scaler_005foptions

> sab looks very similar to smartblur, what algorithm does it use? (I
> still don't understand why sws_scale() is used in both filters even
> the input/output dimensions are the same...).  I use unsharp
> afterwards to get some sharpness back.

Sorry, but I don't know the answer to these questions.