Why are CineForm files larger than my source files?

HDV and AVCHD files are highly compressed. HDV compression varies depending on spatial resolution and frame rate, but in general is about 30:1! AVCHD is compressed even more at about 80:1! 
 
To get to such high compression, many computationally complex algorithms are used. When HDV and AVCHD files are used as the source for editing, a couple things result: 1) poor editing performance (particularly acute with AVCHD source), and 2) lower quality when rendering. 
 
CineForm designed our editing format specifically for that purpose. Very high performance, and very high visual fidelity. Part of the technique we employ is to allow the sizes of the files to grow compared to the source. This creates lots of “headroom” for manipulating your source material in post. It is this extremely high fidelity that has allowed CineForm to be used by major feature film post production facilities and studios. 
 
So how large will your Cineform files be? Generally about 2X to 3X the size of your HDV source files, and about 5X to 8X the size of your AVCHD files.

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