Hello! I have a problem with using ffmpeg to convert some Windows Media files, which I heavily suspect are WMV9. ffmpeg 0.0.9q gives me the following messages when attemting to convert to MPEG4 with mencoder:

Encoding started on Fri Nov 26 04:37:28 CET 2004
MEncoder dev-CVS-041116-19:27-3.3 (C) 2000-2004 MPlayer Team
AltiVec not found
CPU: PowerPC
Using built-in default codecs.conf.
success: format: 0 data: 0x0 - 0x624c49e
Font /usr/local/share/mplayer/font/font.desc loaded successfully! (206 chars)
ASF file format detected.
Too many video packets in the buffer: (1609 in 8391956 bytes).
Maybe you are playing a non-interleaved stream/file or the codec failed?
For AVI files, try to force non-interleaved mode with the -ni option.
ASF: No audio stream found -> no sound.
VIDEO: [2VMW] 720x480 24bpp 1000.000 fps 0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:6 fourcc:0x32564D57 size:720x480 fps:1000.00 ftime:=0.0010
Requested video codec family [wmv8] (vfm=dshow) not available.
Enable it at compilation.
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1 (-1=autodetect) osd: 1
Opening video filter: [scale w=720 h=480]
================================================== ========================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Requested video codec family [wmvdmo] (vfm=dmo) not available.
Enable it at compilation.
Selected video codec: [ffwmv2] vfm:ffmpeg (FFmpeg M$ WMV2/WMV8)
Writing AVI header...
================================================== ========================
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
VDec: vo config request - 720 x 480 (preferred csp: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
SwScaler: using unscaled Planar YV12 -> Planar YV12 special converter
I7:1C/
[wmv2 @ 0x5e69e0]ac-tex damaged at 35 0
[wmv2 @ 0x5e69e0]
error while decoding intra block: 35 x 0 (0)
[wmv2 @ 0x5e69e0]Error at MB: 35
[wmv2 @ 0x5e69e0]concealing 2147483647 errors
videocodec: libavcodec (720x480 fourcc=58564944 [XVID])
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
I7:1E/
[wmv2 @ 0x5e69e0]ac-tex damaged at 31 1
[wmv2 @ 0x5e69e0]
error while decoding intra block: 31 x 1 (3)
[wmv2 @ 0x5e69e0]Error at MB: 77
[wmv2 @ 0x5e69e0]concealing 2147483647 errors
[wmv2 @ 0x5e69e0]I7:7D/
[wmv2 @ 0x5e69e0]ac-tex damaged at 25 0
[wmv2 @ 0x5e69e0]
error while decoding intra block: 25 x 0 (5)
[wmv2 @ 0x5e69e0]Error at MB: 25
[wmv2 @ 0x5e69e0]concealing 2147483647 errors
[wmv2 @ 0x5e69e0]I7:76/
[wmv2 @ 0x5e69e0]dc overflow- block: 2 qscale: 12//
[wmv2 @ 0x5e69e0]
error while decoding intra block: 33 x 0 (2)
[wmv2 @ 0x5e69e0]Error at MB: 33
[wmv2 @ 0x5e69e0]concealing 2147483647 errors
[wmv2 @ 0x5e69e0]I7:1B/
[wmv2 @ 0x5e69e0]ignoring overflow at 28 1
[wmv2 @ 0x5e69e0]ac-tex damaged at 32 1
[wmv2 @ 0x5e69e0]
...

and so on. The resulting file can be opened, but the video (opened in QuickTime) is basically unviewable, with no discernable image, just nearly random color effects. Is there anything I am doing wrong?