[MPlayer-users] mencoder failed to encode anymore

[Sonnie Hook]

I'm using mplayer-586 version 1.0-pre7-0.0 on debian linux. When
encoding to AVI format, the video data is lost:
$  mencoder in.asf -ofps 20 -oac copy -ovc lavc -lavcopts
vcodec=mpeg4:vhq -o out.avi
### output ###
CPU: Intel Pentium 4/Xeon/Celeron Northwood (Family: 8, Stepping: 3)
Detected cache-line size is 64 bytes
CPUflags: Type: 8 MMX: 1 MMX2: 0 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0
Compiled for x86 CPU with extensions: MMX SSE

73 audio & 180 video codecs
success: format: 0  data: 0x0 - 0x9f43000
ASF file format detected.
VIDEO:  [WMV3]  384x288  24bpp  1000.000 fps    0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:6  fourcc:0x33564D57  size:384x288  fps:1000.00
ftime:=0.0010
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 44100 Hz, 1 ch, s16le, 48.0 kbit/6.81% (ratio: 6003->88200)
Selected audio codec: [ffwmav2] afm:ffmpeg (DivX audio v2 (ffmpeg))
==========================================================================
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1  (-1=autodetect) osd: 1
==========================================================================
Opening video decoder: [dmo] DMO video codecs
DMO dll supports VO Optimizations 0 1
DMO dll might use previous sample when requested
GetOutput r=0x0   size:331776  align:1
StreamCount r=0x0  1  1
Decoder supports the following YUV formats: YV12 YUY2 UYVY YVYU
Decoder is capable of YUV output (flags 0x1b)
VDec: vo config request - 384 x 288 (preferred csp: Packed YUY2)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
videocodec: libavcodec (384x288 fourcc=34504d46 [FMP4])
High quality encoding selected (non real time)!
Selected video codec: [wmv9dmo] vfm:dmo (Windows Media Video 9 DMO)
==========================================================================
audiocodec: framecopy (format=161 chans=1 rate=44100 bits=16 bps=6003
sample-1115)
Writing AVI header...
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.
ODML: Aspect information not (yet?) available or unspecified, not
writing vprp header.
Pos:   0.1s      4f ( 0%)   0fps Trem:   0min   0mb  A-V:0.006 [0:0]
Pos:   0.3s      8f ( 0%)   0fps Trem:   0min   0mb  A-V:0.022 [0:48]
Pos:   0.6s     15f ( 0%)   0fps Trem:   0min   0mb  A-V:0.050 [0:48]
Pos:   0.8s     19f ( 0%)   0fps Trem:   0min   0mb  A-V:0.066 [0:48]
Pos:   1.1s     26f ( 0%)   0fps Trem:   0min   0mb  A-V:0.094 [0:48]
### output ###
$ file out.avi
RIFF (little-endian) data, AVI, 384 x 288, 20.00 fps, video:, audio:
DivX (mono, 44100 Hz)

Notice here, this outfile file contains NO video data, why??