I believe the new filter infrastructure is now in ffmpeg. Infact they added many filters lately (1.2 and 2.0 releases) and ported most of libmpcodecs (mplayer's

I believe the new filter infrastructure is now in ffmpeg. Infact they added many filters lately (1.2 and 2.0 releases) and ported most of libmpcodecs (mplayer's) filters. mplayer still doesn't support mkv segment linking.