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December

Remote

GSRC Ptolemy workgroup XML and XSL pages

Saxon

Summary

The idea is that we use the Windows Media Player 9 Windows Media File Editor to generate an XML file that describes the events in a Windows Streaming Media File.

We then perform the following transformations on the XML file

Convert from UTF-16 to UTF-8 so that we can use regular unix tools
Convert absolute slide flip pathnames to relative pathnames
Add markers for each slide flip so that we can navigate
Adjust the markers so that the title of each marker will be the title of the slide

We then take the resulting file and update the file

Setup

The instructions below are Windows Specific

Windows Media Player 9 Windows Media File Editor

The Windows Media File Editor is used to generate a file that describes the events in the media stream

Install the Windows Media Player 9 Windows Media File Editor, which is part of the Windows Media Encoder: http://www.microsoft.com/windows/windowsmedia/9series/encoder/default.asp

Saxon

Saxon is used to transform the output of the Windows Media File Editor.

Download Instant Saxon from http://sourceforge.net/projects/saxon/
Unzip it in c:/cygwin/usr/local/bin
Add c:\cygwin\usr\local\bin to your PATH environment variable.
Under Windows XP, you add to the PATH environment variable by going to the Environment tab of the System control panel (Start Menu -> Settings -> Control Panels -> System -> Advanced -> Environment Variables)
Note that we use backslashes here, and that Windows uses a semicolon as a separate, so we would add
```
;c:\cygwin\usr\local\bin
```
to the end of the PATH

Start up Cygwin bash and verify that saxon is in your path

bash-2.05a$ type saxon
saxon is hashed (/usr/local/bin/saxon)
bash-2.05a$ saxon
No source file name
SAXON 6.5.2 from Michael Kay
Usage: saxon [options] source-doc style-doc {param=value}...
Options: 
  -a              Use xml-stylesheet PI, not style-doc argument 
  -ds             Use standard tree data structure 
  -dt             Use tinytree data structure (default)
  -o filename     Send output to named file or directory 
  -m classname    Use specified Emitter class for xsl:message output 
  -r classname    Use specified URIResolver class 
  -t              Display version and timing information 
  -T              Set standard TraceListener
  -TL classname   Set a specific TraceListener
  -u              Names are URLs not filenames 
  -w0             Recover silently from recoverable errors 
  -w1             Report recoverable errors and continue (default)
  -w2             Treat recoverable errors as fatal
  -x classname    Use specified SAX parser for source file 
  -y classname    Use specified SAX parser for stylesheet 
  -?              Display this message 
bash-2.05a$

Generate a XML description of the events in a stream

In this step, we use Windows Media File Editor to read in a .asf file and generate a .xml file that describes the script events

For performance reasons, copy the media file to the local disk,
Start up Windows Media File Editor, usually found under Start-> All Programs-> Windows Media-> Utilities
Open the file with Windows Media File Editor
Move the script events to the header. This will require that you save the file under a different name. For example, our input file was 01.asf, so we save the file as 01_a.asf File-> Move Scripts to Header . . .-> Note that moving script events to the header was not always available.
Export the header: File -> Export header file. name the exported file talkname.txt For example, if we were working with 01.asf, then the output file would be 01.txt Note that the resulting header file has double wide characters, so don't open it with Emacs, open it with Notepad.



Generate a an html file that will be used to map Powerpoint titles to gifs
 Generate html versions of the Powerpoint presentation.
by using Save As HTML.  See 
Save As HTML.  If the presentation is called 01.ppt,
then Save As HTML will create a directory called 01/
that will contain 01/index.htm that lists
the slides and their titles.



updateheaders
updateheaders uses Saxon to create headers



Download
the video cvs repository:
cvs -d :ext:gigasource.eecs.berkeley.edu:/home/cvs

CVS access requires having a CVS account on gigasource

or
Download pptindex.tar.gz
and uncompress it.

Add
the directory that contains the updateheaders script
to your path
 Under Windows with Cygwin Bash, you can use:
PATH=/cygdrive/c/yourname/src/video/web/ppt/pptindex:${PATH}
export PATH

To permanently set your PATH environment variables in Windows,
do Start -> Settings
-> Control Panel -> System.  Click the Advanced tab and then
the Environment Variables button.

Note that we use backslashes here, and that Windows uses
a semicolon as a separate, so we would add
;c:\yourname\src\video\web\ppt\pptindex;c:\cygwin\usr\local\bin

to the end of the PATH

 Start up Cygwin bash and verify that updateheader
is in your path:
cxh@DOPLAP03 ~
$ PATH=/cygdrive/c/cxh/src/video/web/ppt/pptindex:${PATH}

cxh@DOPLAP03 ~
$ export PATH

cxh@DOPLAP03 ~
$ type updateheader
updateheader is
/cygdrive/c/cxh/src/video/web/ppt/pptindex/updateheader






Create a new xml file that merges the script events and the slide titles
In this step, we merge the file generated by Windows Media File Editor
and the file that contains the slides and their titles.   

 
These steps work for single talks that are not part of a combined
talk.  If the talk is part of a combined, talk, then
see the Combined presentations
section below.



 Change to the directory where the file generated by
the Windows Media File Editor was generated and the HTML version
of the Powerpoint file is located

cd  year/talkname/01

for example
cd 2002/berkeley/01


 Run the updateheader script
updateheader

updateheader takes optional arguments, see the 
updateheader file.

  Use Windows Media File Editor to import
talkname_marker.txt into talkname.asf

for example, use Windows Media File Editor to import
01_marker.txt into
01.asf


Combined presentations

Sometimes multiple presentations are combined into a single presentation
so as to decrease the time between presentations.  If this is the
case, then the slide urls in the asf file of the second and succeeding
presentations will not start at Slide1.gif and the locations of
the gifs for each presentation will be in a single directory instead
of separate directories.  

For example, talks 01, 02, 03 and 04 may be combined into 11.ppt

The url flips for talk 01 will be 
11/Slide1.gif ...
 11/SlideN.gif

  11/SlideN+1.gif will be blank

The url flips for talk 02 will be 
11/SlideN+2.gif ...
 11/SlideM.gif

  11/SlideM+1.gif will be blank

Obviously, this makes things more complicated.

For each individual talk, we need to map the slide flip urls
to the title.  The way we get the title is by converting the Powerpoint
file to html and then looking in the index.htm 
file that was created that contains the titles of each slide.

The problem is that the index.htm file
will start the slide count from 1 for each individual talk, yet
the slide flips in the asf file are ever increasing.

If all the index.htm files generated by converted ppt to html are
concatenated into one file, then ppttitles will properly
handle the titles by looking for jumps in the slide number in the
concatenated file.  The updateheader file calls
ppttitles for us.

updateheader has been extended to take an optional
third argument which is the talk name.  In the case of combined ppt
files, the third argument should be set to the name of the directory
that contains the combined talk and that is the base directory of that
appears in the slide flips in the asf file.  In this case, the
third argument would be 11



 Download the video
cvs repository or tar file.
 Add the directory
that contains the updateheaders script to your path


 Change to the directory that contains the talks.  Usually
this directory will have a name like
2001/santaclara
cd 2001/santaclara


 To generate an index file that has all of the slides in it and
then use that file to update one of the the slide titles, do:

cat 0[1-4]/0[1-4]/index.htm > all.htm

Here, the first four talks 01, 02,
03, 04 were combined into one large
talk called 11.

 Generate the 01/01.txt
file by using Windows Media File Editor on 01/01.asf

 Generate the adjusted header file, which will be
11_markers.txt
updateheader 01/01.txt all.htm 11

  Use Windows Media File Editor to import
01/01_marker.txt into 01.asf
Note that you may need to delete the preexisting script events
from the file first.


Then for the next file, do

 Generate the 02/02.txt
file by using Windows Media File Editor on 02/02.asf

 Generate the adjusted header file, which will be
11_markers.txt
updateheader 02/02.txt all.htm 11


  Use Windows Media File Editor to import
02/02_marker.txt into 02.asf
Note that you may need to delete the preexisting script events
from the file first.


How updateheader works

The updateheader
script does these steps for you.


 Convert the file from UTF-16 to UTF 8 

copy.xsl
 Truncate the urls so that they are relative urls

fixLinks.xsl
 Add a <Markers> section

addMarkers.xsl 
 Read in the NN/index.htm created by saving a Powerpoint file
as a set of html file and generate a second xml file that maps filenames to
titles.

ppttitles 
 Adjust the filename/title map xml file

insertBaseIntoHref.xsl 

 Substitute in titles into the Markers in the first xml file

mergeTitles.xsl 


Adding index links to the page

This has not yet been implemented

The Windows Media Player SDK
has an example of how
to write HTML that will jump to different markers.

 Unfortunately, as of 1/1/03, the jar file that is to be used
with Navigator/Mozilla will not work under Java 1.4, it requires Java 1.3.1.
See markers.htm for a start at an example.
This file requires that an asf file named 01_markers.asf be present.

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