[GRASS5] Re: [GRASS-CVS] hamish: grass/html/html r.out.mpeg.html,1.4,1.5

[Markus Neteler]

On Wed, Oct 20, 2004 at 11:56:44PM +1300, Hamish wrote:
> > > update broken Berkeley ftp link and add link to netpbm's ppmtompeg
> > > which is the same thing as mpeg_encode
> 
> r.out.mpeg is now updated to use 'ppmtompeg' if it exists. This means
> the module will work out of the box on any system with netpbm installed.
> (ie most unix; Cygwin & OSX with a download)
> 
> Note this is MPEG-1, old and inefficient but Free Software.
> 
> Might add a flag in future to dump PPM frames somewhere to let the user
> use a newer non-free encoder. (Xvid? Ogg Theora? the new BBC wavelet one?)
> Maybe a script using g.mlist + r.out.ppm in a loop is a simpler solution.
> 
> 
> > Just curious:
> > Does it work better than the old Berkeley software (which gives
> > terrible errors here)?
> 
> Which version of mpeg_encode? The latest is 1.5c (circa 1995?).

yes, that old one (maybe 1.5b).
 
> I'd very much expect the netpbm version to be better maintained and give
> better results, but that's just a guess. I haven't tried mpeg_encode[*].
> 
> [*] someone who does have mpeg_encode: can you test the module please?
>     Specifically to see if the exit-code test works.
> 
> 
> > If so, what about using 'ppmtompeg' with -c flag and mpeg_encode
> > without?
> 
> The -c flag makes the current region settings for columns and rows
> become the size for the animation. This should probably have some sort
> of error &/or override flag if you try to make a 2000x4000 pixel movie..
> 
> Without the -c flag, a 365 frame movie took about 200mb disk space in
> $MAPSET/.tmp during runtime .. I'm not too worried about that these days.
> 
> 
> No shock, but Mplayer does a much better job on playback than UCB
> mpeg_play. But mpeg_play lets you step frame by frame which is handy.

Without '-c' it works well, writing a MPEG file (playable with Mplayer).

But (same command line, only -c inserted):

GRASS 5.7.cvs:/tmp > r.out.mpeg -c  view1=`g.mlist type=rast pat="modis_lst1km2004*.LST_Day_1km.filt" sep=,`  out=gmovie_with_c.mpg
MPEG ENCODER STATS (1.5b)
------------------------
TIME STARTED:  Wed Oct 20 17:42:43 2004
MACHINE:  unknown
FIRST FILE:  in=/modis_lst1km20040101.LST_Day_1km.filt
LAST FILE:  in=/modis_lst1km20040727.LST_Day_1km.filt
PATTERN:  ibbpbb
GOP_SIZE:  30
SLICES PER FRAME:  1
RANGE:  +/-8
PIXEL SEARCH:  HALF
PSEARCH:  TWOLEVEL
BSEARCH:  CROSS2
QSCALE:  7 12 16
REFERENCE FRAME:  DECODED


ERROR:  Couldn't execute input conversion command:
        r.out.ppm -q in=/modis_lst1km20040101.LST_Day_1km.filt out=-
errno = 22
SLAVE EXITING!!!
WARNING: mpeg_encode ERROR

The slash is wrong (today I have no time to search for it in the code). 

Markus