[MPlayer-users] -vo jpeg output

[Daniele Forghieri]

Geoff wrote:

>I'd like to use mplayer to output jpegs from a video clip. I have used -vo 
>jpeg and it works.
>
>Now I want to do something a little different.
>
>I want to capture jpegs from a 30 sec clip and save them in grayscale. I also 
>want them to be captured at a different rate than the original clip, say 
>15fps instead of 30fps. So instead of 900 jpegs from a 30 sec clip I get 450 
>jpegs.
>
>I have tried the incredible array of switches and read the man page over and 
>over and any way of doing this eludes me.
>
>Anyone have any suggestions?
>
>THNX,
>Geoff
>  
>
use the framestep filter if you want one every x frames (I use it to get 
one frame per second using -vf framestep=25) or
use the decimate filter to output the frame when the content of the 
frame change.

    Daniele Forghieri