[theora] ogg movie out of png pics

[All Pebre]

Well, I don't understand anything!!... yesterday everything was
working fine and today after creating stream.yum (which has a 0 b ??)
the following command freezes the terminal and nothing happens:

elachistos| mplayer "mf://*.png" -mf type=png:fps=3 -vo
yuv4mpeg:file=stream.yuv
MPlayer 2:0.99+1.0pre7try2+cvs20060117-0ubuntu8 (C) 2000-2006 MPlayer Team
CPU: Intel Pentium M Dothan (Family: 6, Stepping: 8)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.


91 audio & 204 video codecs
Linux RTC init error in ioctl (rtc_irqp_set 1024): Permission denied
Try adding "echo 1024 > /proc/sys/dev/rtc/max-user-freq" to your
system startup scripts.
Opening joystick device /dev/input/js0
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick
Setting up LIRC support...
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support.
You will not be able to use your remote control.
Playing mf://*.png.
[mf] search expr: *.png
[mf] number of files: 91 (364)
VIDEO:  [MPNG]  0x0  24bpp  3.000 fps    0.0 kbps ( 0.0 kbyte/s)
Using (default) progressive frame
mode.==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffpng] vfm: ffmpeg (FFmpeg PNG decoder)
==========================================================================
Audio: no sound
Starting playback...
VDec: vo config request - 640 x 480 (preferred colorspace: BGR 8-bit)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
Opening video filter: [palette]
VDec: using BGR 8-bit as output csp (no 2)
Movie-Aspect is undefined - no prescaling applied.

SwScaler: BICUBIC scaler, from BGRA to Planar YV12 using MMX2
VO: [yuv4mpeg] 640x480 => 640x480 Planar YV12


And that's it!

I don't want to go back to avis and mpegs... I want an ogg movie! Can
anybody help me?