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      advmng - AdvanceCOMP MNG Compression Utility

      :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]
      :     [-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...

      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

      * 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.

      -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
            .mng file.

      -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".

      -2, --shrink-normal
            Set the compression level to "normal". This is the
            default level of compression.

      -3, --shrink-extra
            Set the compression level to "extra".

      -4, --shrink-insane
            Set the compression level to "insane". It's VERY

      -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.

      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

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

See Also
      advzip(1), advpng(1), advdef(1)

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