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<TITLE>The making of multimedia files</TITLE>
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<H1>
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The making of multimedia files
</H1>
<A NAME="mpeg">
If normal modes are animated and the user selects <code>Save drawing/TIFF</code> from
the main window menu a series of TIFF files is written out, one for each
frame of the animation (currently 20 frames which cannot be changed by
the user). These TIFF files can easily be converted to a video file (MPEG)
showing the animation using standard image manipulation tools from the Internet.
One possible MPEG encoder is <code>mpeg_encode</code> which is available from
<A NAME="tex2html32"
HREF="ftp://mm-ftp.CS.Berkeley.EDU/pub/mpeg/encode/"><TT>ftp://mm-ftp.CS.Berkeley.EDU</TT></A>
via anonymous ftp. This encoder expects its input files
either in PPM, PNM, or YUV format. To convert the TIFF files written by
V<SMALL>IEWMOL</SMALL> you can use the PBMPLUS or NETPBM libraries which have a filter
tifftopnm (you also need pnmflip, since tifftopnm changes the orientation of
the picture). The following shell script will do the conversion (for sh and
ksh users) if the default files from V<SMALL>IEWMOL</SMALL> have been used:
<PRE>
for i in vm_image*.tiff
do
j=`basename $i tiff`pnm
tifftopnm $i | pnmflip -topbottom > $j
done
</PRE>
The resulting PNM files can then be processed by <code>mpeg_encode</code> to produce
a MPEG file which can, e. g., be included into a World Wide Web document.
<P>
Selecting <code>Save drawing/Rayshade</code> from the main window menu with an
animation running will write a series of 20 input files for R<SMALL>AYSHADE</SMALL>.
These files can also be processed by R<SMALL>AYSHADE</SMALL> and used to generate
a movie of the vibration. This process can, however, be very time consuming.
<P>
<BR><HR>
<ADDRESS>
<A HREF="mailto:joehill@users.sourceforge.net"><I>Jrg-Rdiger Hill</I></A><BR>Sun Dec 10 17:38:35 MET 2000
</ADDRESS>
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