It seems that only x11 mode is working now. -zoom mode consumes so much cpu that my 1,3 duron drops frames, and I don't want subtitles on film.
When I use mplayer -vo help - everything seems to be fine:
        xv      X11/Xv
        x11     X11 ( XImage/Shm )
        xover   General X11 driver for overlay capable video output drivers
        gl      X11 (OpenGL)
        gl2     X11 (OpenGL) - multiple textures version
        dga     DGA ( Direct Graphic Access V2.0 )
        sdl     SDL YUV/RGB/BGR renderer (SDL v1.1.7+ only!)
        fbdev   Framebuffer Device
        fbdev2  Framebuffer Device
        svga    SVGAlib
        aa      AAlib
        png     PNG file
        jpeg    JPEG file
        null    Null video output
        pgm     PGM file
        md5     MD5 sum
        mpegpes Mpeg-PES to DVB card
        yuv4mpeg        yuv4mpeg output for mjpegtools (to "stream.yuv")
        vesa    VESA VBE 2.0 video output
        xvidix  X11 (VIDIX)
        cvidix  console VIDIX
        tga     Targa output
debian:/home/michal# sdl-config --version
and here:
michal@debian:/mnt/Magazyn/003_FILMY/Filmy/*****$ mplayer -vo sdl *****.avi
MPlayer 1.0pre5-3.3.4 (C) 2000-2004 MPlayer Team

CPU: Advanced Micro Devices Duron MG Morgan 1300 MHz (Family: 6, Stepping: 1)
Detected cache-line size is 64 bytes
CPUflags:  MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
Compilled for processor with those extensions: MMX MMX2 3DNow 3DNowEx SSE

Reading config file /usr/local/etc/mplayer/mplayer.conf: There's no such file or directory
Reading config file /home/michal/.mplayer/config
Reading /home/michal/.mplayer/codecs.conf: Can't open '/home/michal/.mplayer/codecs.conf': There's no such file or directory
Reading /usr/local/etc/mplayer/codecs.conf: 73 audio & 180 video codecs
Font /home/michal/.mplayer/font/font.desc loaded successfully! (233 chars)
Failed to open /dev/rtc: No access (it should be readable by the user.)
Using usleep() timing
Can't open input config file /home/michal/.mplayer/input.conf: here's no such file or directory
Input config file /usr/local/etc/mplayer/input.conf parsed: 53 binds

Playing *****.avi.
Wykryto format AVI.
VIDEO:  [XVID]  480x256  12bpp  25,000 fps  844,3 kbps (103,1 kbyte/s)
Clip info:
 Software: Nandub v1.0rc2
SUB: Detected subtitle file format: vplayer
SUB: Read 745 subtitles.
SUB: Adjusted 745 subtitle(s).
SUB: added subtitle file (1): .*****.txt
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
MP3lib: init layer2&3 finished, tables done
AUDIO: 44100 Hz, 2 ch, 16 bit (0x10), ratio: 14000->176400 (112,0 kbit)
Selected audio codec: [mp3] afm:mp3lib (mp3lib MPEG layer-2, layer-3)
SDL: Using driver: x11
vo: X11 running at 1280x1024 with depth 24 and 32 bpp (":0.0" => local display)
opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm:ffmpeg (FFmpeg MPEG-4)
Checking audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...
AF_pre: af format: 2 bps, 2 ch, 44100 hz, little endian signed int
AF_pre: 44100Hz 2ch Signed 16-bit (Little-Endian)
AO: [oss] 44100Hz 2ch Signed 16-bit (Little-Endian) (2 bps)
Building audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...
Zaczynam odtwarzanie...
VDec: Needed configuration vo - 480 x 256 (preferred csp: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Film proportions (video) to 1,88:1 - skaluję do prawidłowych proporcji.
VO: [sdl] 480x256 => 480x256 Planar YV12
A: 260,0 V: 260,0 A-V:  0,045 ct:  0,066  6501/6501   6%  5%  1,3% 0 0 0%
(I had to translate mplayer messages from my language).

I tried to reinstall sdl, and I compiled mplayer three times. Nothing helped - when I try to use sdl - I just see black screen and hear audio. When I try to use xv - mplayer video window (video area) is transparent, it has only borders. Does anybody have an idea what can be wrong ?

thx, Michael.