[FFmpeg-user] Reg:conversion of video file

[ranjini raguu]

Im using ffmpeg for converting audio n video.... the conversion is working
fine... but whn i add some presets values the conversion is missing
somewhere i.e after conversion the length of the video is not displayed so
tat the video cannot be seeked... how to fix this so tat the length should
be identifies after conversion.....
  wat can we do for it?