I had to edit some videos from the Internet recently and found that Kdenlive is an amazing tool to get the job done. It is very straight forward, multi-track, non-linear video editor makes projects very easy to accomplish.

I was able to just import FLV files, chop them up, reassemble their order, add transitions, and export the new video as an MP4 among other formats. I assume it is using FFMPEG to get the encoding done, which is a great transcoding program for any platform.

The Kdenlive community is also very strong, providing support via the usual methods of forums, IRC, video tutorialsand even a wikibook.

I had a very positive experience with Kdenlive and will continue to use it on all of my video editing projects. Thank you Kdenlive team and community!