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Do I making some mistake?

Here verbose mencoder output during second pass (1-video pass):

MEncoder CVS-020508-22:43-3.0.4 (C) 2000-2002 Arpad Gereoffy (see DOCS!)

CPU vendor name: AuthenticAMD  max cpuid level: 1
CPU: Advanced Micro Devices Athlon TB Thunderbird (Type: 6, Stepping: 2)
extended cpuid-level: 6
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 0 SSE2: 0
Reading /home/marco/.mplayer/codecs.conf: 34 audio & 91 video codecs
font: can't open file: /home/marco/.mplayer/font/font.desc
Font /usr/local/share/mplayer/font/font.desc loaded successfully! (495 chars)
Detected AVI file format!
MainAVIHeader.dwFlags: (2320) HAS_INDEX IS_INTERLEAVED TRUST_CKTYPE
VIDEO:  [FrNo]  0x0  24bpp  25.00 fps  105.7 kbps (12.9 kbyte/s)
Using pass3 control file: frameno.avi
Reading from stdin...
success: format: 0  data: 0x0 - 0x0
Checking for YUV4MPEG2
DEMUXER: freeing demuxer at 0x828b288  
ASF_check: not ASF guid!
DEMUXER: freeing demuxer at 0x828b288  
Checking for NuppelVideo
DEMUXER: freeing demuxer at 0x828b288  
Checking for MOV
DEMUXER: freeing demuxer at 0x828b288  
Checking for VIVO
header block 1 size: 0
DEMUXER: freeing demuxer at 0x828b288  
Checking for REAL
DEMUXER: freeing demuxer at 0x828b288  
DEMUXER: freeing demuxer at 0x828b288  
DEMUXER: freeing demuxer at 0x828b288  
DEMUXER: freeing demuxer at 0x828b288  
DEMUXER: freeing demuxer at 0x828b288  
DEMUXER: freeing demuxer at 0x828b288  
system stream synced at 0x100D (0)!
==> Found audio stream: 0
==> Found video stream: 0
Detected MPEG-PS file format!
Searching for sequence header... OK!
VIDEO:  MPEG2  352x288  (aspect 2)  25.00 fps  5353.5 kbps (669.2 kbyte/s)
[V] filefmt:2  fourcc:0x10000002  size:352x288  fps:25.00  ftime:=0.0400
libavcodec: CPU flags: mmx mmxext 3dnow
Expand: -1 x -1, -1 ; -1  (-1=autodetect) osd: 1
Opening video filter 'pp' with args '(null)'...
[expand] query(Planar YV12) -> 1
[expand] query(Planar I420) -> 1
[expand] query(Planar IYUV) -> 1
Opening video filter 'scale' with args '352:264'...
SwScale: 352 x 264 (-1=no scaling)
==========================================================================
Opening Video Decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 352 x 288, Mpeg PES  
[PP] Using external postprocessing filter, max q = 6
vo_debug: query(Mpeg PES) returned 0x0 (i=0) 
Sorry, selected video_out device is incompatible with this codec.
VDecoder init failed :(
Opening Video Decoder: [libmpeg2] MPEG 1/2 Video decoder v2.0
libmpeg2: Using MMXEXT for IDCT transform
libmpeg2: Using MMXEXT for motion compensation
VDec: vo config request - 352 x 288, Planar YV12  
[PP] Using external postprocessing filter, max q = 6
scale: query(BGR 32-bit) -> 0
scale: query(BGR 24-bit) -> 0
scale: query(BGR 16-bit) -> 0
scale: query(BGR 15-bit) -> 0
scale: query(Planar YV12) -> 1
scale: query(Planar I420) -> 1
scale: query(Planar IYUV) -> 1
vo_debug: query(Planar YV12) returned 0xC01 (i=0) 
scale: query(BGR 32-bit) -> 0
scale: query(BGR 24-bit) -> 0
scale: query(BGR 16-bit) -> 0
scale: query(BGR 15-bit) -> 0
scale: query(Planar YV12) -> 1
scale: query(Planar I420) -> 1
scale: query(Planar IYUV) -> 1
vo_debug: query(Planar I420) returned 0xC01 (i=1) 
scale: query(BGR 32-bit) -> 0
scale: query(BGR 24-bit) -> 0
scale: query(BGR 16-bit) -> 0
scale: query(BGR 15-bit) -> 0
scale: query(Planar YV12) -> 1
scale: query(Planar I420) -> 1
scale: query(Planar IYUV) -> 1
vo_debug: query(Planar IYUV) returned 0xC01 (i=2) 
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
video_out->init(352x288->384x288,flags=0,'MPlayer',0x32315659)
scale: query(BGR 32-bit) -> 0
scale: query(BGR 24-bit) -> 0
scale: query(BGR 16-bit) -> 0
scale: query(BGR 15-bit) -> 0
scale: query(Planar YV12) -> 1
scale: query(Planar I420) -> 1
scale: query(Planar IYUV) -> 1
SwScale scaling 352x288 Planar YV12 to 352x264 Planar YV12  
SwScaler: reducing / aligning filtersize 1 -> 4
SwScaler: reducing / aligning filtersize 1 -> 4
SwScaler: reducing / aligning filtersize 6 -> 5
SwScaler: reducing / aligning filtersize 6 -> 5

SwScaler: BICUBIC scaler, from Planar YV12 to Planar YV12 using MMX2
SwScaler: using 4-tap MMX scaler for horizontal luminance scaling
SwScaler: using 4-tap MMX scaler for horizontal chrominance scaling
SwScaler: using n-tap MMX scaler for vertical scaling (YV12 like)
SwScaler: 352x288 -> 352x264
REQ: flags=0xC01  req=0x0  
REQ: flags=0x401  req=0x0  
REQ: flags=0x401  req=0x0  
videocodec: libavcodec (352x264 fourcc=58564944 [DIVX])
Detected video codec: [mpeg12] drv:1 prio:0 (MPEG 1 or 2)
==========================================================================
==========================================================================
audiocodec: framecopy (format=55 chans=2 rate=44100 bits=0 bps=13110 sample=0)
Writing AVI header...
XXX initial  v_pts=0.000  a_pos=6729 (0.522) 
*** [scale] Allocating mp_image_t, 352x288x12bpp YUV planar, 152064 bytes
*** [scale] Allocating mp_image_t, 352x288x12bpp YUV planar, 152064 bytess 0/5 D/S 0/0 
*** [pp] Allocating mp_image_t, 352x264x12bpp YUV planar, 139392 bytes
*** [lavc] Allocating mp_image_t, 352x264x12bpp YUV planar, 139392 bytes
*** [expand] Direct Rendering mp_image_t, 352x264x12bpp YUV planar, 139392 bytes
using npp filters 0x100000/0x100000
*** [scale] Allocating mp_image_t, 352x288x12bpp YUV planar, 152064 bytess 0/16 D/S 0/0 
Pos: 224.2s   5595f ( 9%)  46fps Trem:  20min 125mb  A-V:0.000 [324:103] A/Vms 0/13 D/S 10/0 

--
Regards,  Marco Gigante
Student at Pisa University - Computer Engineering