[root@host1 upload]# /usr/local/bin/ffmpeg -i 724822crazy-frog.avi -ar 22050 -ab 32 -b 500 -f flv -s 640x480 - | /usr/local/bin/flvtool2 -U stdin test.flv
ffmpeg version CVS, build 3277056, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --enable-shared
  built on Oct  7 2007 21:12:42, gcc: 3.4.6 20060404 (Red Hat 3.4.6-8)
Input #0, avi, from '724822crazy-frog.avi':
  Duration: 00:02:56.7, start: 0.000000, bitrate: 116 kb/s
  Stream #0.0, 15.00 fps: Video: mpeg4, yuv420p, 208x156
  Stream #0.1: Audio: mp3, 16000 Hz, mono, 24 kb/s
Output #0, flv, to 'pipe:':
  Stream #0.0,   nan fps: Video: flv, yuv420p, 640x480, q=2-31, 500 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
frame= 2651 q=0.0 Lsize=   10951kB time=176.7 bitrate= 507.6kbits/s
video:9902kB audio:0kB global headers:0kB muxing overhead 10.591006%
[root@host1 upload]#