[MPlayer-users] resizing

[Corey Hickey]

Tomoki Taniguchi wrote:
> (-vop scale=w:h)  I'm trying to set all thumbnails to a particular width.  
> this option seems to only work when the size change is a clean one...  
> meaning 3x,2x, ...1/2 x,1/3 x....  But when the change is not a clean one it 
> distorts the image.  The each row in the image is shifted over some....   

I messed around a bit, and I couldn't find any weird resolutions that
break either gif89a or jpeg output. Your regular -vo driver might not be
able to handle them, but the image ouputs should.

> 
> (-x, -y, -xy)  tried using these three options.  According to the screen 
> output, the images are being scaled properly, but the final output file is 
> still the same size as the images created without those options.
> 
Yes. -vop operates on the video before it gets to the -vo driver, while
-x/y are options that get passed to the video output. Since gif and jpeg
aren't hardware scaled, you have to specify -zoom in order to make the
software scale the image.