MPEG

MPEG Streamclip 1.2.1b6

With a download size of only 327KB, you'd expect MPEG Streamclip to be, well, a little underpowered. And yet, the program opens multiple files, DVDs or URLs of video streams; can trim, cut, copy or paste parts of your footage; and has options to rotate your footage or export the soundtrack, while its Export dialog provides more control over your finished video than some commercial products.

It's not all good news - we had problems playing back some MP4 files - but if you're just looking for trimming and file conversion features then MPEG Streamclip is definitely worth a try.
dowload : http://www.techradar.com/downloads/windows-movie-maker