Why dont you simply download some video cutter from web. There are lots of options for you.
Few i can suggest you is a top guide on
how to cut FLV video. It also supports trimming almost all kinds of video files like MP4, AVI, MOV, WMV, MKV, ASF, MXF, AVHCD, MTS, MOD, WebM, OGV, 3GP, etc.
It is a real time saver. Love it.