[root@ip-208-109-95-146 archivos_video]# ffmpeg -i 20070719073004.wmv -f flv test.flv
FFmpeg version SVN-r11051, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-libmp3lame --enable-libvorbis --disable-mmx --enable-shared
  libavutil version: 49.5.0
  libavcodec version: 51.48.0
  libavformat version: 51.19.0
  built on Nov 18 2007 14:56:44, gcc: 4.1.2 20070626 (Red Hat 4.1.2-13)

Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 14.99 (15000/1001)
Input #0, asf, from '20070719073004.wmv':
  Duration: 00:03:03.7, start: 3.000000, bitrate: 97 kb/s
    Stream #0.0: Audio: wmav2, 16000 Hz, mono, 16 kb/s
    Stream #0.1: Video: wmv1, yuv420p, 320x240 [PAR 0:1 DAR 0:1], 80 kb/s, 14.99 tb(r)
Output #0, flv, to 'test.flv':
    Stream #0.0: Video: flv, yuv420p, 320x240 [PAR 0:1 DAR 0:1], q=2-31, 200 kb/s, 14.99 tb(c)
    Stream #0.1: Audio: libmp3lame, 16000 Hz, mono, 64 kb/s
Stream mapping:
  Stream #0.1 -> #0.0
  Stream #0.0 -> #0.1
[libmp3lame @ 0x54f3f0]flv does not support that sample rate, choose from (44100, 22050, 11025).
Could not write header for output file #0 (incorrect codec parameters ?)