[MPlayer-users] 回复： Re: flv with alpha channel

[Oliver Seitz]

I didn't believe it at first, too, but it seems flv really supports
alpha-channel within videos.

http://www.adobe.com/devnet/flash/articles/alpha_video.html

I can tell that it is not very common to have a real apha-channel in video
files, so even not knowing internals of mplayer/mencoder I doubt that it
would be an easy task to implement a feature like this.

Greets,

Kiste