[FFmpeg-user] problem buffering m4v movies

[Marcel Kraan]

Hello,
When i convert my movies to .m4v jwplayer is not playing my movies until the entire movie is loaded.
Is this a convert option? 

sample of a movie:
http://eengoedidee.nl/videoz/download.cgi?mem_id=32&fil_unique=ui5gf9TM228AAH7KxTMAAABJ


syntax of my convert.
ffmpeg -i 'file.flv' -y -acodec libfaac -ab 96k -ac 2 -vcodec libx264 -bufsize 5000K -vpre hq -vpre ipod640 -threads 0 -crf 22 'file.m4v'

i like to start the file after a few seconds or a few percents of loading.

Is this the problem of ffmpeg of jwplayer?  

i don't know where to start.

Marcel Kraan