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cemil@blah/~/test$ ffmpeg -i test.mov -s 512x288 -b 500k -r 25 -acodec libmp3lame -ar 22050 -ab 96k -pass 1 -f flv test.flv
FFmpeg version SVN-r9836, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-pthreads --enable-libmp3lame --enable-libx264 --enable-gpl --enable-libfaad --enable-libfaac
  libavutil version: 49.4.1
  libavcodec version: 51.40.4
  libavformat version: 51.12.1
  built on Aug  7 2007 14:52:42, gcc: 4.0.1 (Apple Computer, Inc. build 5363)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x4620a0]negative ctts, ignoring
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
  Duration: 00:01:04.3, start: 0.000000, bitrate: 3660 kb/s
  Stream #0.0(eng): Video: h264, yuv420p, 720x406, 25.00 fps(r)
  Stream #0.1(eng): Audio: mpeg4aac, 44100 Hz, stereo
  Stream #0.2(eng): Data: tmcd / 0x64636D74
Output #0, flv, to 'test.flv':
  Stream #0.0(eng): Video: flv, yuv420p, 512x288, q=2-31, pass 1, 500 kb/s, 25.00 fps(c)
  Stream #0.1(eng): Audio: libmp3lame, 22050 Hz, stereo, 96 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
frame= 1609 fps= 45 q=4.7 Lsize=    4985kB time=64.1 bitrate= 637.1kbits/s    
video:4170kB audio:751kB global headers:0kB muxing overhead 1.295316%
cemil@blah/~/test$ ffmpeg -i test.mov -s 512x288 -b 500k -r 25 -acodec libmp3lame -ar 22050 -ab 96k -pass 2 -f flv test.flv
FFmpeg version SVN-r9836, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-pthreads --enable-libmp3lame --enable-libx264 --enable-gpl --enable-libfaad --enable-libfaac
  libavutil version: 49.4.1
  libavcodec version: 51.40.4
  libavformat version: 51.12.1
  built on Aug  7 2007 14:52:42, gcc: 4.0.1 (Apple Computer, Inc. build 5363)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x4620a0]negative ctts, ignoring
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
  Duration: 00:01:04.3, start: 0.000000, bitrate: 3660 kb/s
  Stream #0.0(eng): Video: h264, yuv420p, 720x406, 25.00 fps(r)
  Stream #0.1(eng): Audio: mpeg4aac, 44100 Hz, stereo
  Stream #0.2(eng): Data: tmcd / 0x64636D74
File 'test.flv' already exists. Overwrite ? [y/N] y
Output #0, flv, to 'test.flv':
  Stream #0.0(eng): Video: flv, yuv420p, 512x288, q=2-31, pass 2, 500 kb/s, 25.00 fps(c)
  Stream #0.1(eng): Audio: libmp3lame, 22050 Hz, stereo, 96 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
frame= 1609 fps= 69 q=11.3 Lsize=    4664kB time=64.1 bitrate= 596.0kbits/s    
video:3849kB audio:751kB global headers:0kB muxing overhead 1.385762%