ITS Format
The data are in <filename>.
The indexes for each frame are in <filename>.its
The program 'its' reads <filename> and produces <filename>.its

The indexs are a u64 which points to the start of a frame in <filename>.
Each frame starts with the sync word sw[] = {0xeb, 0x90, 0x14, 0x6f, 0x00}
Then 
width: u16
height: u16
num images: u16
