/usr/local/bin/ffmpeg -y  -i '/home/www/flipshop/dev/tmp/20110418063.mp4' -s 640x480 -vcodec 'libx264' -threads 0 -f  mp4 -vpre hq -pass 2 -b 2048000 -ab 96000 -acodec 'libfaac' -ar 41000 -ac 1 '/home/www/flipshop/dev/tmp/App_FFMPEG_TAky8N' 2>&1
Array
(
    [0] => FFmpeg version SVN-r21861, Copyright (c) 2000-2010 Fabrice Bellard, et al.
    [1] =>   built on Feb 17 2010 12:15:58 with gcc 4.3.2
    [2] =>   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-pthreads --enable-libfaac --enable-libfaad --enable-libmp3lame --enable-libtheora --enable-libx264 --enable-libxvid --enable-x11grab
    [3] =>   libavutil     50. 9. 0 / 50. 9. 0
    [4] =>   libavcodec    52.54. 0 / 52.54. 0
    [5] =>   libavformat   52.52. 0 / 52.52. 0
    [6] =>   libavdevice   52. 2. 0 / 52. 2. 0
    [7] =>   libswscale     0.10. 0 /  0.10. 0
    [8] =>   libpostproc   51. 2. 0 / 51. 2. 0
    [9] => Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/www/flipshop/dev/tmp/20110418063.mp4':
    [10] =>   Metadata:
    [11] =>     major_brand     : mp42
    [12] =>     minor_version   : 0
    [13] =>     compatible_brands: mp423gp4isom
    [14] =>   Duration: 00:00:41.98, start: 0.000000, bitrate: 2088 kb/s
    [15] =>     Stream #0.0(und): Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 1989 kb/s, 14.74 fps, 30k tbr, 30k tbn, 30k tbc
    [16] =>     Stream #0.1(und): Audio: aac, 48000 Hz, mono, s16, 96 kb/s
    [17] => [libx264 @ 0x8bb3990]using SAR=1/1
    [18] => [libx264 @ 0x8bb3990]MB rate (36000000) > level limit (983040)
    [19] => [libx264 @ 0x8bb3990]using cpu capabilities: MMX2
    [20] => [libx264 @ 0x8bb3990]requested bitrate is too low. estimated minimum is 19433 kbps
    [21] => Output #0, mp4, to '/home/www/flipshop/dev/tmp/App_FFMPEG_TAky8N':
    [22] =>     Stream #0.0(und): Video: libx264, yuv420p, 640x480 [PAR 1:1 DAR 4:3], q=10-51, pass 2, 2048 kb/s, 90k tbn, 30k tbc
    [23] =>     Stream #0.1(und): Audio: aac, 41000 Hz, mono, s16, 96 kb/s
    [24] => Stream mapping:
    [25] =>   Stream #0.0 -> #0.0
    [26] =>   Stream #0.1 -> #0.1
    [27] => Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
)