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AdvanceCOMP MNG Compression Utility(1)	AdvanceCOMP MNG Compression Utility(1)

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  com‐
	      pressed. 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  compres‐
	      sor.   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  monodi‐
	      rectional patterns like "-s 16x0" or "-s 0x16".

       -S, --scroll-square N
	      This  option  is like the option "-s NxN" but excludes big move‐
	      ment on both directions reducing the computation time.  Specifi‐
	      cally 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)  specifica‐
	      tions. 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)
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