[MPlayer-users] How to suppress background noise

[Matthias Wieser]

Am Donnerstag, 23. Oktober 2003 20:57 schrieb Alain Barthélemy:

> Pinnacle PCTV card BT878 chipset
>
> After capturing the image is very good but I have an horrific
> background noise. I don't have such a loudly noise if I listen
> directly to the video cassette or TV with KwinTV.
>
> Where could the problem be? The PCTV card has already been used before
> without that problem (not with mplayer/mencoder).

Maybe that other software had a denoise filter or you just had a higher 
compression ratio.

You coult change the video cable (you use s-video?), close the case of 
your PC, replace your BT878 against a modern low-noise card,...


> Is there some filter with mencoder to eliminate some high-frequencies
> sound or some Dolby-like filter?

You could read "man mplayer" (http://www.MPlayerHQ.hu/DOCS/en/
documentation.html doesn't contain info about video filters) and the 
output of "mplayer -vf help" and "mplayer -pphelp".

> Or could I change something in the
> code line above to correct that problem.

> Thank you for any suggestion.
> mencoder -tv driver=v41:width=640:height=480

Is your video interlaced (and you want to deinterlace it)? Than you should 
use full width and height.

> tv:// -vf eq=10:5 -o test.avi -endpos xx:xx:xx

Why -vf eq=10:5?
"-tv 
driver=v4l:width=[...]:brightness=5:contrast=0:saturation=20:volume=40" 
exists.

If you want to _see_ what effects Mplayer's video filter produce, see 
http://home.knuut.de/MWieser_/

                Matthias