[root@xxx cron]# crontab -l

*/ 1  * * * * /usr/local/bin/ffmpeg > /cron/ffmpeg.log

[root@xxx cron]# /usr/local/bin/ffmpeg
FFmpeg version SVN-r20934, Copyright (c)  2000 - 2009  Fabrice Bellard, et al.
  built on Dec  27   2009   15 : 11 : 45  with gcc  4 . 1 . 2   20080704  (Red Hat  4 . 1 . 2 - 46 )
  configuration: --enable-libmp3lame --disable-mmx --enable-shared
  libavutil      50 .  7 .  0  /  50 .  7 .  0 
  libavcodec     52 . 45 .  0  /  52 . 45 .  0 
  libavformat    52 . 44 .  0  /  52 . 44 .  0 
  libavdevice    52 .  2 .  0  /  52 .  2 .  0 
  libswscale      0 .  7 .  2  /   0 .  7 .  2 
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'

Dec  27   19 : 13 : 01  job1 crond[ 22310 ]: (root) CMD (/usr/local/bin/ffmpeg > /cron/ffmpeg.log)