VirtualDub is a very good tool for video editing (cutting, slicing, encoding, ...). Unfortunately it's Windows only, so Mac users have to look for an alternative (unless you want to run VirtualDub in a virtual machine

). Avidemux seems to be a good replacement. It also has a copy mode (in case you just want to delete some parts of the video or concatenate a couple of files that share the same format/container and codecs) for copying video and audio streams without reencoding (thus without loss of quility) and a "light"/clean user interface (something that I loved in VirtualDub). And Avidemux is cross-platform, meaning that it supports all major operating systems (Mac, Linux, Windows) and might be portable to other platforms without a major rewrite.
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