Why does it take so long to trim video clips? Is there any video editing software that will quickly cut and assemble segments of video files and save it in the same format with little or no quality loss? I have videos from a sony HD video camera .m2ts, Lumix AVCHS lite camera .mts, and kodak video .mov as well as .avi and wmv video files. I don't want to convert formats just keep the clips in the same format. The software i have tried is very slow for what would seem to be a simple task, defining and merging clips in the same format as the original. This would seem to only require editing at the seams between segments, not every frame so should be fast. But this seems to take 10s of minutes or hours to complete and the resulting video is lower quality or larger in size. Any recommendations?