[MPlayer-users] flv with alpha channel

[Phil Oleynik]

叶树根 wrote:
> hi all
>   Making movies with mencoder from png images.
>   my command is:
>   mencoder "mf://*.png" -mf fps=25:type=png -ovc vfw -xvfwopts codec=vp6vfw.dll -of flv -o ffff.flv
>   I can get .flv file,  but it's lost alpha channel.
>    
>   Do i need to give an extra command to keep the alpha channel ? 
> Does anybody know how to get a flv file with an alpha channel ?
>
>       
Hello,
is it possible to make a movie with alpha channel at all? Why is it so 
important?
Phil