Provided by: grass-doc_6.4.3-3_all bug


       r.out.mpeg  - Raster File Series to MPEG Conversion.


       raster, export


       r.out.mpeg help
       r.out.mpeg        [-qc]       view1=string[,string,...]        [view2=string[,string,...]]
       [view3=string[,string,...]]          [view4=string[,string,...]]           [output=string]
       [qual=integer]   [--verbose]  [--quiet]

           Quiet - suppress progress report

           Convert on the fly, use less disk space (requires r.out.ppm with stdout option)

           Verbose module output

           Quiet module output

           Raster file(s) for View1

           Raster file(s) for View2

           Raster file(s) for View3

           Raster file(s) for View4

           Name for output file
           Default: gmovie.mpg

           Quality factor (1 = highest quality, lowest compression)
           Options: 1-5
           Default: 3


       r.out.mpeg  is  a  tool  for  combining a series of GRASS raster maps into a single MPEG-1
       (Motion Pictures Expert Group) format file.  MPEG-1 is a "lossy" video compression format,
       so  the  quality of each resulting frame of the animation will be much diminished from the
       original raster image.  The resulting output file may then be viewed using  your  favorite
       mpeg-format viewing program.  MPEG-2 and MPEG-4 provide much better quality animations.

       The  user may define up to four "views", or sub-windows, to animate simultaneously.  e.g.,
       View 1 could be rainfall, View 2 flooded areas, View 3 damage to bridges or levees, View 4
       other  economic  damage,  all  animated  as a time series. A black border 2 pixels wide is
       drawn around each view. There is an arbitrary limit of 400 files per view  (400  animation
       frames).   Temporary  files are created in the conversion process, so lack of adequate tmp
       space could also limit the number of frames you are able to convert.

       The environment variable GMPEG_SIZE is checked for a value to use  as  the  dimension,  in
       pixels,  of  the  longest dimension of the animation image.  If GMPEG_SIZE is not set, the
       animation size defaults to the rows & columns in the  current  GRASS  region,  scaling  if
       necessary  to  a  default minimum size of 200 and maximum of 500.  These size defaults are
       overridden when using the -c flag (see below).  The resolution of the current GRASS region
       is maintained, independent of image size.  Playback programs have to decode the compressed
       data "on-the-fly", therefore smaller dimensioned  animations  will  provide  higher  frame
       rates and smoother animations.

       UNIX - style wild cards may be used with the command line version in place of a raster map
       name, but wild cards must be quoted.


       r.out.mpeg view1="rain[1-9]","rain1[0-2]" view2="temp*"

       If the number of files differs for  each  view,  the  view  with  the  fewest  files  will
       determine the number of frames in the animation.

       With  -c  flag  the  module converts "on the fly", uses less disk space by using r.out.ppm
       with stdout option to convert frames as needed instead of converting  all  frames  to  ppm
       before encoding.  Only use when encoding a single view.  Use of this option also overrides
       any size defaults, using the CURRENTLY DEFINED GRASS REGION for the output  size.   So  be
       careful to set region to a reasonable size prior to encoding.

       A  quality  value  of  qual=1  will yield higher quality images, but with less compression
       (larger MPEG file size).  Compression ratios will vary depending on the number  of  frames
       in  the animation, but an MPEG produced using qual=5 will usually be about 60% the size of
       the MPEG produced using qual=1.


       MPEG images must be 16-pixel aligned for successful compression, so if the rows &  columns
       of  the calculated image size (scaled, with borders added) are not evenly divisible by 16,
       a few rows/columns will be cut off the bottom & right sides of the image. The MPEG  format
       is  optimized  to recognize image MOTION, so abrupt changes from one frame to another will
       cause a "noisy" encoding.


       This program requires the program mpeg_encode (aka ppmtompeg):

       MPEG-1 Video Software Encoder
       (Version 1.3; March 14, 1994)

       Lawrence A. Rowe, Kevin Gong, Ketan Patel, and Dan Wallach Computer Science Division-EECS,
       Univ. of Calif. at Berkeley

       Available from Berkeley:
       or as part of the netpbm package (ppmtompeg):

       Playback may be done with many viewers;  mpeg_encode's  official  companion  is  mpeg_play
       available  from  Berkeley  at or a
       precompiled  Debian   package   from   (includes
       maintained source code).

       Use of the -c flag requires the r.out.ppm GRASS module with the stdout option.




       Bill Brown, U.S. Army Construction Engineering Research Laboratories

       Last changed: $Date: 2008-05-16 12:09:06 -0700 (Fri, 16 May 2008) $

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