[MEncoder-users] Audio LAVC, couldn't find encoder for codec wmav2.

[cook smart]

I download "MPlayer 1.0rc1 Windows" package and use mencoder, Now  encount
some error, Can anyone help me?
Thanks very much.

The mencoder command is:
mencoder -af lavcresample=44100 -vf harddup -of lavf -oac lavc -ovc lavc
-lavcopts aglobal=1:vglobal=1:vcodec=wmv2:acodec=wmav2 -lavfopts
i_certify_that_my_video_stream_does_not_use_b_frames test.flv -o
test_wmv.wmv


Output Information:
MEncoder 1.0rc1-3.4.2 (C) 2000-2006 MPlayer Team
CPU: Intel(R) Celeron(R) CPU 1.80GHz (Family: 15, Model: 1, Stepping: 3)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 0 SSE2: 0
Compiled with runtime CPU detection.
success: format: 0  data: 0x0 - 0x2803b5
libavformat file format detected.
VIDEO:  [FLV1]  320x240  0bpp  15.000 fps    0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:35  fourcc:0x31564C46  size:320x240  fps:15.00  ftime:= 0.0667
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 22050 Hz, 2 ch, s16le, 8.0 kbit/1.13% (ratio: 1000->88200)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
** MUXER_LAVF
*****************************************************************
You have certified that your video stream does not contain B frames.
REMEMBER: MEncoder's libavformat muxing is presently broken and will
generate
INCORRECT files in the presence of B frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
Opening video filter: [harddup]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffflv] vfm: ffmpeg (FFmpeg Flash video)
==========================================================================
Audio LAVC, couldn't find encoder for codec wmav2.

Exiting...