Merge/Join MP4 Videos

Using cat on the command line to simply merge multiple MPEG4 files into one, will just not work. VLC will stop after the first part.
But this is not really surprising, the header is originating from the first file and still contains the information about the single file.
I am now using a mencoder wrapper script to merge multiple MPEG4 files into a new MPEG4 container named complete.mp4:

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