HTTP error 0

i am using windows 7 & video 6.x-4.1-rc4 & FFmpeg Wrapper 6.x-1.1-beta2

in Video transcoder, i was using ffmpeg for transcoding n it is working

then i changed my video trancoder to FFmpeg Wrapper,
& when i upload video this error occurs "An HTTP error 0 occurred. /vivid/filefield/ahah/video/field_video/0"

[
in my php.ini, i set this..
max_execution_time = 300 ; Maximum execution time of each script, in seconds
max_input_time = 300 ; Maximum amount of time each script may spend parsing request data
memory_limit = 128M ; Maximum amount of memory a script may consume (16MB)
]

so what is the problem??
plzz help.