[MEncoder-users] Filter large dots

[Rich Felker]

On Fri, Apr 21, 2006 at 07:40:38PM +0200, Marco wrote:
> Is there a way to filter large dots quickly appearing and disappearing?
> 
> I'm talking about large (more than 3px) dots with irregular shape.
> Sometimes they have the shape of a single hair.
> 
> They are usually present in just a single frame. This kind of noise is
> very common with old tapes remastered in dvd format.
> 
> I tried hqdn3d, but I think that it should be used for different noises.

What you really want is a sort of median denoiser. Unfortunately
mplayer/mencoder does not have such a filter. You could try:

-vf pp=md,rotate=1,pp=md,rotate=2

but I suspect this will hurt video quality a good bit and might not
even help, depending on the size of the artifacts... :)

Rich