[MPlayer-users] Why is it "Skipping frame!"s?

[Matthias Czapla]

Hello!

Just out of curiosity I wonder whats causing mencoder to skip frames (the
resulting AVI plays fine) 

$ nice -19 mencoder -oac copy -ovc lavc \
-lavcopts vcodec=mpeg4:mbd=2:trell:vbitrate=509:vpass=$i \
-sws 2 -vf crop=672:316:24:130,scale=544:240 \
-dvd-device some_dvd_image.bin dvd://1

MEncoder 1.0pre3-2.95.4 (C) 2000-2003 MPlayer Team

CPU: Intel Celeron 2/Pentium III Coppermine,Geyserville 1094 MHz (Family: 6,
Stepping: 6)
Detected cache-line size is 32 bytes
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0
Compiled for x86 CPU with extensions: MMX MMX2 SSE

Reading /home/lal/.mplayer/codecs.conf: Can't open
'/home/lal/.mplayer/codecs.conf': No such file or directory
Reading /usr/local/etc/mplayer/codecs.conf: Can't open
'/usr/local/etc/mplayer/codecs.conf': No such file or directory
Using built-in default codecs.conf.
AVI file format detected.
VIDEO:  [FrNo]  720x576  24bpp  25.000 fps    0.8 kbps ( 0.1 kbyte/s)
Using pass3 control file: frameno.avi
Reading config file /home/lal/.mplayer/mencoder: No such file or directory
font: can't open file: /home/lal/.mplayer/font/font.desc
Font /usr/local/share/mplayer/font/font.desc loaded successfully! (206
chars)
Reading disc structure, please wait...
There are 1 titles on this DVD.
There are 14 chapters in this DVD title.
There are 1 angles in this DVD title.
DVD successfully opened.
success: format: 0  data: 0x0 - 0x2BCD3800
LMLM4 Stream Format not found
MPEG-PS file format detected.
VIDEO:  MPEG2  720x576  (aspect 2)  25.000 fps  3500.0 kbps (437.5 kbyte/s)
[V] filefmt:2  fourcc:0x10000002  size:720x576  fps:25.00  ftime:=0.0400
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1  (-1=autodetect) osd: 1
Opening video filter: [scale w=544 h=240]
Opening video filter: [crop w=672 h=316 x=24 y=130]
Crop: 672 x 316, 24 ; 130
==========================================================================
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 720 x 576 (preferred csp: Mpeg PES)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
The selected video_out device is incompatible with this codec.
VDecoder init failed :(
Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.3.1
Selected video codec: [mpeg12] vfm:libmpeg2 (MPEG 1 or 2 (libmpeg2))
==========================================================================
audiocodec: framecopy (format=55 chans=2 rate=44100 bits=0 bps=14000
sample=1)
Writing AVI header...
VDec: vo config request - 720 x 576 (preferred csp: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
SwScaler: reducing / aligning filtersize 6 -> 8
SwScaler: reducing / aligning filtersize 6 -> 8
SwScaler: reducing / aligning filtersize 7 -> 6
SwScaler: reducing / aligning filtersize 7 -> 6

SwScaler: BICUBIC scaler, from Planar YV12 to Planar YV12 using MMX2
videocodec: libavcodec (544x240 fourcc=58564944 [DIVX])
High quality encoding selected (non real time)!
Pos:   0.8s     22f ( 0%)   1fps Trem:   0min   0mb  A-V:0.000 [0:112]
Skipping frame!
Pos:   1.2s     32f ( 0%)   1fps Trem:   0min   0mb  A-V:0.000 [99:112]
Skipping frame!
Pos:   1.6s     42f ( 0%)   1fps Trem:   0min   0mb  A-V:0.000 [248:112]
Skipping frame!
Pos:   1.9s     52f ( 0%)   1fps Trem:   0min   0mb  A-V:0.000 [348:112]
Skipping frame!
Pos:   2.3s     62f ( 0%)   2fps Trem:   0min   0mb  A-V:0.000 [373:112]
Skipping frame!
[ ... and so on ... ]

Regards
Matthias