Can not stream mp2v in 0.99a

[xiaobei]

hi all,
I use RPMforge to have 0.9.9a for those versions on CentOS 5.4,just run yum install vlc!
It is ok ,besides transcoding to mp2v.
command as:
cvlc -vvv /home/provideo/Spider-man_3_trailer_720p.mpg --sout '#transcode{vcodec=mp2v,vb=4096,scale=1,fps=25,acodec=mpga,ab=128,channels=2,venc=ffmpeg{keyint=40,hurry-up=4,deinterlace,vt=800000}}:duplicate{dst=std{access=udp,mux=ts,url=192.168.0.39:1234}}'

I get this error:

[00000519] avcodec encoder error: cannot open encoder
[00000519] main encoder warning: no encoder module matching "ffmpeg" could be loaded
[00000519] main encoder debug: TIMER module_Need() : 5.534 ms - Total 5.534 ms / 1 intvls (Avg 5.534 ms)
[00000434] stream_out_transcode stream out error: cannot find video encoder (module:ffmpeg fourcc:mp2v)
[00000518] main decoder debug: removing module "libmpeg2"
[00000434] stream_out_transcode stream out error: cannot create video chain
[00000517] main packetizer error: cannot create packetizer output (mpgv)
....

It is very strange,I can transcode to mp4v and h264 and so on. Why it clue to that it don't find ffmpeg? I just run yum install vlc,and I notice ffmpeg installed.
Who can help me!

Thanks!