[FFmpeg-user] Live preview video editing

[Murthy avsn]

Hi all, I want to create an online video editing tool,which shows a live preview(like YouTube's  video editor).
I experimented with FFmpeg rtmp protocol .
ffmpeg -i  concat:1.fms|2.fms -f flv 'rtmp://localhost/editor/edit'
Question :Is there any way can I make such a live preview with seeking capability . Can some one please give me any hint.
Thanks you all.