AdvanceCOMP MNG Compression General(CommAdvanceCOMP 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 libdeflate com-
pressor. 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 op-
tion.
-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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