[FFmpeg-user] Possible to encode a file with a broken header?

[Mr M]

I uploaded my file CI-No-Video-Sample.flv to the mplayer ftp server
and my command I am trying to use is:

ffmpeg -i FILE.flv -vcodec libxvid -b:v 981k -r 29.970 -acodec
libmp3lame -b:a 128k -async 1 FILE.avi