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

[Andrew Wason]

RC <cooleyr <at> gmail.com> writes:
> Easy or not, On2 presumably already did it.  MEncoder is the program
> behind their "Flix Engine" Linux SDK (no doubt the app running behind
> the scenes at YouTube). And to make things even easier, you can download
> a free demo (which thereby gives you the right to request the source
> code, with all modifications they've made). 


On2 FlixEngine patches to mencoder are available to anyone here. There are some
useful fixes in there:
http://support.on2.com/gpl/mplayer/

But they don't encode VP6 with alpha using mencoder, they just use mencoder to
transcode source files into an intermediate ogg container with yv12/pcm into a
named pipe that a separate proprietary 'flixd' process then transcodes into VP6
FLV (with alpha if desired).

e.g.
/usr/local/libexec/on2/flixengine/mencoder -oac pcm -af dummy -ovc raw
-vf format=yv12 -of ogg -mc 0 -quiet -o /tmp/namedpipe <inputfile>


Andrew