NAME

       advmng - AdvanceCOMP MNG Compression Utility

SYNOPSIS

       advmng [-l, --list] [-z, --recompress]
            [-x, --extract] [-a, --add RATE MNG_FILE PNG_FILES...]
            [-0, --shrink-store] [-1, --shrink-fast] [-2, --shrink-normal]
            [-3, --shrink-extra] [-4, --shrink-insane] [-i, --iter N]
            [-s, --scroll HxV] [-S, --scroll-square]
            [-e, --expand] [-r, --reduce]
            [-c, --lc] [-C, --vlc] [-f, --force] [-q, --quiet] [-v, --verbose]
            [-h, --help] [-V, --version] FILES...

DESCRIPTION

       The  main  purpose of this utility is to recompress MNG files to get the smallest possible
       size.

       Please note that this utility is not able to read a generic file. It’s granted to be  able
       to read only the files generated by the AdvanceMAME emulator.

       To compress the files this utility uses the following strategies:
       •      Remove all ancillary chunks.
       •      Use  the  MNG Delta feature to compress video clips with only small changes between
              frames.
       •      Use the MNG Move feature to  compress  video  clips  with  a  scrolling  background
              (option -s).
       •      Reduce the color depth to 8 bit (option -r).
       •      Use the 7zip Deflate implementation.

COMMANDS

       -l, --list FILES...
              List the content of the specified files.

       -z, --recompress FILES...
              Recompress  the specified files. If the -1, -2, -3 options are specified, it’s used
              the smallest file choice from the previous compressed data and the new compression.
              If the -0 option is specified the file is always rewritten without any compression.

       -x, --extract FILES...
              Extract all the .png frames in the .mng clips.  You can use the --shrink options to
              control the compression ratio of the .png files. The extracted images are always 24
              bit  images  with  alpha  channel.   You  can  remove the alpha channel with the -n
              option.

       -a, --add RATE MNG_FILE PNG_FILES...
              Compress all the .png files on the command line as a .mng file. All the .png  files
              must  have  the  same size and the same bit depth. You must also specify an integer
              frame rate to use in the

OPTIONS

       -0, --shrink-store
              Disable the compression. The file is only stored and not compressed.  The  file  is
              always rewritten also if it’s bigger.

       -1, --shrink-fast
              Set the compression level to ˝fast˝ using the zlib compressor.

       -2, --shrink-normal
              Set the compression level to ˝normal˝ using the 7z compressor.  This is the default
              level of compression.

       -3, --shrink-extra
              Set the compression level to ˝extra˝ using the 7z compressor.  You can  define  the
              compressor iterations with the -i, --iter option.

       -4, --shrink-insane
              Set  the compression level to ˝insane˝ using the zopfli compressor.  You can define
              the compressor iterations with the -i, --iter option.

       -i, --iter N
              Define an additional numer of iterations for the  7z  and  zopfli  compressors  for
              modes  -3  and  -4.   More  iterations  usually  give a better compression, but may
              require a lot more time.  Try for example with 10, 15, 20, and so on.

       -s, --scroll HxV
              The ˝-s HxV˝ option specifies the size of the pattern (H width x V height) used  to
              check  for  a  scrolling background. The size is expressed in pixels and it must be
              bigger or equal than the scrolling speed of the background. For  example  take  the
              game  1942  that scrolls vertically by 1 pixel every frame. If you recorded with an
              interleave factor of 2 the vertical scrolling speed is 1*2 = 2. In  this  case  the
              minimum  pattern is ˝-s 0x2˝.  Generally you can use ˝-s 8x8˝ and use bigger values
              only for  games  scrolling  faster.  If  the  game  scrolls  only  horizontally  or
              vertically  you  can  speed  up a lot the compression with monodirectional patterns
              like ˝-s 16x0˝ or ˝-s 0x16˝.

       -S, --scroll-square N
              This option is like  the  option  ˝-s  NxN˝  but  excludes  big  movement  on  both
              directions reducing the computation time. Specifically the check done is X+Y<=N.

       -r, --reduce
              Force  the color reduction to 8 bit. The reduction is really done only if any frame
              have less than 256 colors and  if  no  alpha  channel  is  present.  To  force  the
              reduction also if an alpha channel is present use the -n option.

       -e, --expand
              Force the color expansion to 24 bit.

       -n, --noalpha
              Remove the alpha channel if present.

       -c, --lc
              Force  the use of the MNG LC (Low Complexity) specifications. It disables the delta
              compression.  The file is always rewritten also if it’s bigger.

       -C, --vlc
              Force the use of the MNG VLC (Very Low Complexity) specifications. It disables  the
              delta  compression and the precise timing. Warning! you may lose the correct timing
              information because the VLC format only supports integer  frequency.  The  file  is
              always rewritten also if it’s bigger.

       -f, --force
              Force the use of the new file also if it’s bigger.

       -q, --quiet
              Don’t print the filenames.

       -v, --verbose
              Print more information on the compression process.

EXAMPLES

       A good tradeoff of recompression and time is the command :

           advmng -z -r -S 16 *.mng

       To create a .mng file from a series of .png files use the command :

           advmng -a 30 video.mng video*.png

       To extract all the images in a .mng file use the command :

           advmng -x video.mng

COPYRIGHT

       This file is Copyright (C) 2003 Andrea Mazzoleni, Filipe Estima

SEE ALSO

       advzip(1), advpng(1), advdef(1)

                                                           AdvanceCOMP MNG Compression Utility(1)