[MEncoder-users] mencoder error: Assertion `len > 0 && len <= asf->packetsize' failed

[sam]

Hello,
I'm trying unsuccessfully to convert a wmv file to a avi file using mencoder.
It's a Fedora Core 8, AMD 64 machine.
mplayer gives the same error when I try to view the clip but it works fine with xine.
Here's the main error message:

mencoder: libmpdemux/demux_asf.c:519: demux_asf_fill_buffer: Assertion `len > 0 && len <= asf->packetsize' failed.

Here's command output:

$ mencoder test.wmv -ofps 23.976 -ovc lavc -oac copy -o output.avi -noskip -mc 0
MEncoder dev-SVN-r26936-4.1.2 (C) 2000-2008 MPlayer Team
CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 4600+ (Family: 15, Model: 75, Stepping: 2)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
success: format: 0  data: 0x0 - 0x9cfe8ba
ASF file format detected.
[asfheader] Audio stream found, -aid 1
[asfheader] Video stream found, -vid 2
VIDEO:  [WMV3]  480x352  24bpp  1000.000 fps  710.0 kbps (86.7 kbyte/s)
[V] filefmt:6  fourcc:0x33564D57  size:480x352  fps:1000.000  ftime:=0.0010
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Requested video codec family [wmv9dmo] (vfm=dmo) not available.
Enable it at compilation.
Requested video codec family [wmvdmo] (vfm=dmo) not available.
Enable it at compilation.
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffwmv3] vfm: ffmpeg (FFmpeg WMV3/WMV9)
==========================================================================
audiocodec: framecopy (format=161 chans=1 rate=44100 bits=16 B/s=6003 sample-2230)
VDec: vo config request - 480 x 352 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
videocodec: libavcodec (480x352 fourcc=34504d46 [FMP4])
New_Face failed. Maybe the font path is wrong.
Please supply the text font file (~/.mplayer/subfont.ttf).
subtitle font: load_sub_face failed.
New_Face failed. Maybe the font path is wrong.
Please supply the text font file (~/.mplayer/subfont.ttf).
subtitle font: load_sub_face failed.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
mencoder: libmpdemux/demux_asf.c:519: demux_asf_fill_buffer: Assertion `len > 0 && len <= asf->packetsize' failed.
Aborted


Suggestions welcomed.
Thanks for your time.


sam