[MPlayer-users] mencoder/crop => image distortion

Nico nsabbi at libero.it
Tue Jul 8 14:54:44 CEST 2003

1) xvid makes mess with non 16x dimensions
2) when dvd are displayed, the final video is subject to an aspect ratio 
if  A/R is 16:9 then the final image has size = 720 * 16/9   x   576   
 == 1024 x 576 ;

if you want to keep A/R intact and crop the black bars you have to 
rescale the cropped image following the proportion:
    1024 : Y = 720 : y   

so y = (Y * 720) / 1024 rounded to the nearest multiple of 16
in your case Y = 550, y = 384

Eventually you will need to replace 720  with the right value of X, but 
in your case I would keep those few pixels.

Hope it helps,


ROED,HAAVARD (HP-Norway,ex1) wrote:

>[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>Ofcourse, encoding with:
>mencoder -dvd 14 -oac copy -ovc xvid -xvidencopts
>bitrate=1272:me_quality=5:4mv -vop crop=720:550:0:12 -o movie.avi
>seems to give a good result, but then the black sidebands are in the video,
>So rescaling is the only option? crop at 714:550:2:12, and rescaling to
>704x502? Is that a good choice?
>RTFM!!!  http://www.MPlayerHQ.hu/DOCS
>Search:  http://www.MPlayerHQ.hu/cgi-bin/htsearch

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