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mp4 to flv using ffmpeg on Ubuntu server 10.04

I am doing a conversion of mp4 to flv on a GUI less server where I have only SSH access.( I tried winff and X forwarding that had hanged while doing this conversion so winff is not possible for me)

I do not have any idea of the
codecs,bitrate of this mp4 video.
Some one had converted from an m4v to mp4 and then uploaded this on the server.

When I tried converting on command line
as follows

Code:

ffmpeg -i stats_estimation.mp4 out.flv

FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1, Copyright (c) 2000-2009 Fabrice Bellard, et al.

  configuration: --extra-version=4:0.5.1-1ubuntu1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static

  libavutil    49.15. 0 / 49.15. 0

  libavcodec    52.20. 1 / 52.20. 1

  libavformat  52.31. 0 / 52.31. 0

  libavdevice  52. 1. 0 / 52. 1. 0

  libavfilter    0. 4. 0 /  0. 4. 0

  libswscale    0. 7. 1 /  0. 7. 1

  libpostproc  51. 2. 0 / 51. 2. 0

  built on Mar  4 2010 12:41:55, gcc: 4.4.3



Seems stream 0 codec frame rate differs from container frame rate: 29.94 (5000/167) -> 44.92 (539/12)

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'stats_estimation.mp4':

  Duration: 02:47:05.56, start: 0.000000, bitrate: 237 kb/s

    Stream #0.0(eng): Video: h264, yuv420p, 320x240, 44.92 tbr, 14.97 tbn, 29.94 tbc

    Stream #0.1(eng): Audio: aac, 32000 Hz, stereo, s16

Output #0, flv, to 'out.flv':

    Stream #0.0(eng): Video: flv, yuv420p, 320x240, q=2-31, 200 kb/s, 90k tbn, 44.92 tbc

    Stream #0.1(eng): Audio: adpcm_swf, 32000 Hz, stereo, s16, 64 kb/s

Stream mapping:

  Stream #0.0 -> #0.0

  Stream #0.1 -> #0.1

[adpcm_swf @ 0xa4ef60]Sample rate must be 11025, 22050 or 44100

Error while opening codec for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height

I have above error.
I checked this page
http://www.ffmpeg.org/ffmpeg-doc.html
but I could not understand much.
Can some one help to figure out what should I be doing to get this video to flv in this case?
The OS is Ubuntu 10.04 64 bit server edition and
aptitude install winff
was what I had used to get ffmpeg or any thing else.

What you need to know is in the last two lines of the output.

Code:

[adpcm_swf @ 0xa4ef60]Sample rate must be 11025, 22050 or 44100

Error while opening codec for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height

The sample rate of the input file audio, 32000Hz, is not an accepted value for swf audio. You need to resample it. Try adding -ar 44100, or one of the other values listed, to the command.

This did not gave me error but what happened at the end is I lost the sound completely the video came.

Code:

ffmpeg -i stats_estimation.mp4 -ar 22050 -acodec libmp3lame -ab 32K -r 25 -vcodec flv out.flv

again gave me error
http://pastebin.com/enKdM9u

Code:

Unknown encoder 'libmp3lame'

So I did

Code:

sudo aptitude install libmp3lame

 libmp3lame0

Which happened successfully then I tried
again

Quote:

ffmpeg -i stats_estimation.mp4 -ar 22050 -acodec libmp3lame -ab 32K -r 25 -vcodec flv out.flv
.
.
.
Unknown encoder 'libmp3lame'

The same error.

Your version of ffmpeg doesn't have liblame support enabled. If it were, there'd be an entry saying --enable-libmp3lame in the configuration line. I'm going to guess you're using your distro's default version, which won't have anything included that's encumbered by patents or other intellectual property restrictions.

You can get a fully-enabled version for Debian from the debian-multimedia repositories, and from Medibuntu for the Ubuntu family. I'm not sure about other distros.