[vlc-devel] the reason why start-time has no effect while transcoding

[zhu shi song]

I can't control progress bar while playing wmv video file. 
VLC-1.1.11,VLC-1.2.0-pre3 all have the same problem.  It's the reason 
why start-time can't work for transcoding.   But  windows media player 
works fine to control the time progress bar while playing the video. So I think it's the bug of VLC.  How can I do to fix the problem?
Thanks.