fab@medion:~/mm% mencoder -o /tmp/foo.avi -nosound -ovc x264 arraydemo.mp4
MEncoder dev-SVN-r18943-4.0.3 (C) 2000-2006 MPlayer Team
CPU: Intel(R) Pentium(R) M processor 1.73GHz (Family: 6, Model: 13, Stepping: 8)
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2

success: format: 0  data: 0x0 - 0x3341eb
ISO: File Type Major Brand: ISO/IEC 14496-1 (MPEG-4 system) v2
Quicktime/MOV file format detected.
[V] filefmt:7  fourcc:0x7634706D  size:0x0  fps: 0.00  ftime:=0.0000
Couldn't find video filter 'x264'.
Failed to open the encoder.

Exiting...
fab@medion:~/mm%                                                          14h33