Download Avidemux: it supports numerous formats giving you a wide choice for your editing needs.
Avidemux is a free video editor with several supported formats. The freeware allows the import of AVI, DivX, XviD, MPEG 1/2, MPEG 4, H263(+), Mov/3GP, OGM, as well as MP3, WMA, AAC and WAV in multiple audio tracks. Many other popular formats and codecs are also supported.
All of the actions taken can be saved as scripts in a list and used as pre-built macros in other projects.
In order to burn the finished files on (S)VCD and DVD you will need an external burning program.
Verdict: Avidemux is a first-rate video editor that offers countless adjustment possibilities to cut and synchronise video and audio.