Usage, description and the like...

usage: modcopy.py [options] [src_dir [dest_dir]]

  src_dir      source directory to search for MOD/MOI
  dest_dir     destination directory for MPG files
options:
  -h, --help    show this help message and exit
  -f, --force   override files with same name in destination directory
  -g, --gui     force interactive mode
 -p, --preview preview only, don't copy, don't create non-existent directories

The aspect ratio is coded in the MPG sequence headers.

• sequence header starts with 00 00 01 B3
• aspect ratio is encoded in upper nibble at byte with offset 7
  

  Value	Aspect Ratio
  0	'forbidden'
  1	1:1 Square Pixels
  2	4:3 Display
  3	16:9 Display
  4	2.21:1 Display
  5-15	'reserved'

See also: http://www.fr-an.de/fragen/v06/01_02_02.htm

See http://en.wikipedia.org/wiki/MOI_(file_format)